Remove #includes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7339 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify some makefile magic, no functional changes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7336 91177308-0d34-0410-b5e6-96231b3b80d8

Add fixmes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7335 91177308-0d34-0410-b5e6-96231b3b80d8

(1) Major fix to the way unused regs. are marked and found for the FP
    Single and FP double reg types (which share the same reg class).
    Now all methods marking/finding unused regs consider the regType
    within the reg class, and SparcFloatRegClass specializes this code.
(2) Remove machine-specific regalloc. methods that are no longer needed.
    In particular, arguments and return value from a call do not need
    machine-specific code for allocation.
(3) Rename TargetRegInfo::getRegType variants to avoid unintentional
    overloading when an include file is omitted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7334 91177308-0d34-0410-b5e6-96231b3b80d8

This test has been automatized

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7333 91177308-0d34-0410-b5e6-96231b3b80d8

Update to use more modern graph checker

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7332 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase, an automatized version of Vikrams ggcollapse.c file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7331 91177308-0d34-0410-b5e6-96231b3b80d8

1. Fix a case that was marking the invalid reg. num. (-1) as used,
   causing a nasty array bound error later.
2. Fix silly typo causing logical shift of unsigned long to use
   SRL instead of SRLX.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7330 91177308-0d34-0410-b5e6-96231b3b80d8

(1) Change the way unused regs. are marked and found to consider regType
    info (since multiple reg types may share the same reg class).
(2) Remove machine-specific regalloc. methods that are no longer needed.
    In particular, arguments and return value from a call do not need
    machine-specific code for allocation.
(3) Rename TargetRegInfo::getRegType variants to avoid unintentional
    overloading when an include file is omitted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7329 91177308-0d34-0410-b5e6-96231b3b80d8

Change the way unused regs. are marked and found to consider regType
info (since multiple reg types may share the same reg class).
Remove machine-specific regalloc. methods that are no longer needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7328 91177308-0d34-0410-b5e6-96231b3b80d8

Remove unused field.  Change the way unused regs. are marked and
found to consider regType info (since multiple reg types may share
the same reg class, e.g., single and double on Sparc).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7327 91177308-0d34-0410-b5e6-96231b3b80d8

Add an assertion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7326 91177308-0d34-0410-b5e6-96231b3b80d8

Remove testcase which has been automatized

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7325 91177308-0d34-0410-b5e6-96231b3b80d8

Checkin of Vikram's ggfuncptr.c test adapted for automatic checking

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7324 91177308-0d34-0410-b5e6-96231b3b80d8

Dont' try to parse the colon

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7323 91177308-0d34-0410-b5e6-96231b3b80d8

Add a more general check-flags which can be used to ensure arbitrary flags are set

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7322 91177308-0d34-0410-b5e6-96231b3b80d8

Include llvm/Support/Mangler.h first. Don't include <iostream>, <set>,
<string>, or llvm/Value.h.  Move up the inclusion of llvm/Support/Mangler.h.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7321 91177308-0d34-0410-b5e6-96231b3b80d8

Don't include llvm/SlotCalculator.h, or <set>.
Move up the inclusion of llvm/Support/Mangler.h.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7320 91177308-0d34-0410-b5e6-96231b3b80d8

Forward-declare class Module to make the header file self-contained.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7319 91177308-0d34-0410-b5e6-96231b3b80d8

More cassert inclusion for GCC 3.3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7318 91177308-0d34-0410-b5e6-96231b3b80d8

Change reference to assert.h to mention cassert

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7317 91177308-0d34-0410-b5e6-96231b3b80d8

Brian implemented the static compiler, take it off the list

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7316 91177308-0d34-0410-b5e6-96231b3b80d8

#include <cassert> as necessary...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7315 91177308-0d34-0410-b5e6-96231b3b80d8

Fix another accessibility problem illuminated by GCC 3.3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7314 91177308-0d34-0410-b5e6-96231b3b80d8

Fix visibility problem exposed by GCC 3.3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7313 91177308-0d34-0410-b5e6-96231b3b80d8

Remove inline declarations that GCC 3.3 doesn't like without a body

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7312 91177308-0d34-0410-b5e6-96231b3b80d8

Regardless of whether C provides assert.h, C++ source can always include
<cassert>, making this header unneeded.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7311 91177308-0d34-0410-b5e6-96231b3b80d8

Use the C++ <cassert> header, not the C <assert.h> header

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7310 91177308-0d34-0410-b5e6-96231b3b80d8

This header works with GCC 3.3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7309 91177308-0d34-0410-b5e6-96231b3b80d8

Use C++ headers, not C headers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7308 91177308-0d34-0410-b5e6-96231b3b80d8

Add includes of assert

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7307 91177308-0d34-0410-b5e6-96231b3b80d8

Fix accessibility problems GCC 3.3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7306 91177308-0d34-0410-b5e6-96231b3b80d8

Add assert.h include

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7305 91177308-0d34-0410-b5e6-96231b3b80d8

Convert to C++ style comments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7304 91177308-0d34-0410-b5e6-96231b3b80d8

Include vector into these two files to ensure that specializations like
stl_bvector.h are correctly included into *anything* that includes hash_map
or hash_set.  ext/hash_map includes stl_vector.h directly and leaves
out the specializations, causing truly nasty bugs due to inconsistent
versions of vector<> being used for vector<bool> in different files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7303 91177308-0d34-0410-b5e6-96231b3b80d8

Made a bunch of cleanups, as per Chris' recommendations:
* Removed unused global and member variables
* Fixed comments (CodeGeneratorBug.cpp)
* Check for possibly failing GCC::create() and CBE::create()
* Remove generated files after diffing the output (e.g., shared object)
* Instead of using std::for_each, use explicit loops as std::for_each may
  duplicate the functor, and ours carries state
* Changed member var from cl::opt<std::string> to just std::string
* Fixed doxygen comments
* Fixed string comparisons to use [ str.empty() ] instead of [ str == "" ]
* Cache instances of CBE and GCC in BugDriver across compilations and executions
  while testing tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7302 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanups:

Mangler.cpp: Constify parameter to makeNameProper, and use const_iterator.
 Make Count an unsigned int, and use utostr().
 Don't name parameters things that start with underscore.
Mangler.h: All of the above, and also: Add Emacs mode-line.  Include <set>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7301 91177308-0d34-0410-b5e6-96231b3b80d8

Factor out name-mangling from X86/Printer, which is derived from CWriter,
into this new support class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7300 91177308-0d34-0410-b5e6-96231b3b80d8

Use unified CWriter-X86/Printer name mangler.  Do not bother using
SlotCalculator in CWriter.  (Unfortunately, all this means a lot of
X86/Printer's methods have to be de-constified again.  Oh well.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7299 91177308-0d34-0410-b5e6-96231b3b80d8

More testcases, which I'll implement later

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7298 91177308-0d34-0410-b5e6-96231b3b80d8

Modernize testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7297 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7296 91177308-0d34-0410-b5e6-96231b3b80d8

Instcombine: (A >> c1) << c2 for signed integers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7295 91177308-0d34-0410-b5e6-96231b3b80d8

New testcases for signed shifts

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7294 91177308-0d34-0410-b5e6-96231b3b80d8

Major addition to bugpoint: ability to debug code generators (LLC and LLI).
The C backend is assumed correct and is used to generate shared objects to be
loaded by the other two code generators.

LLC debugging should be functional now, LLI needs a few more additions to work,
the major one is renaming of external functions to call the JIT lazy function
resolver.

Bugpoint now has a command-line switch -mode with options 'compile' and
'codegen' to debug appropriate portions of tools.

ExecutionDriver.cpp: Added implementations of AbstractInterpreter for LLC and
GCC, broke out common code within other tools, and added ability to generate C
code with CBE individually, without executing the program, and the GCC tool can
generate executables shared objects or executables.

If no reference output is specified to Bugpoint, it will be generated with CBE,
because it is already assumed to be correct for the purposes of debugging using
this method. As a result, many functions now accept as an optional parameter a
shared object to be loaded in, if specified.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7293 91177308-0d34-0410-b5e6-96231b3b80d8

Reorganization of code, no functional changes.
Now it shoudl be a bit more efficient

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7292 91177308-0d34-0410-b5e6-96231b3b80d8

It doesn't appear that we need to #include these.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7291 91177308-0d34-0410-b5e6-96231b3b80d8

Allow folding several instructions into casts, which can simplify a lot
of codes.  For example,
short kernel (short t1) {
  t1 >>= 8; t1 <<= 8;
  return t1;
}

became:

short %kernel(short %t1.1) {
        %tmp.3 = shr short %t1.1, ubyte 8               ; <short> [#uses=1]
        %tmp.5 = cast short %tmp.3 to int               ; <int> [#uses=1]
        %tmp.7 = shl int %tmp.5, ubyte 8                ; <int> [#uses=1]
        %tmp.8 = cast int %tmp.7 to short               ; <short> [#uses=1]
        ret short %tmp.8
}

before, now it becomes:
short %kernel(short %t1.1) {
        %tmp.3 = shr short %t1.1, ubyte 8               ; <short> [#uses=1]
        %tmp.8 = shl short %tmp.3, ubyte 8              ; <short> [#uses=1]
        ret short %tmp.8
}

which will become:
short %kernel(short %t1.1) {
        %tmp.3 = and short %t1.1, 0xFF00
        ret short %tmp.3
}

This implements cast-set.ll:test4 and test5

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7290 91177308-0d34-0410-b5e6-96231b3b80d8

Minor cleanups

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7289 91177308-0d34-0410-b5e6-96231b3b80d8

Constify most methods. We could have constified doInitialization and
doFinalization too except that would have made them shadow, not override,
the parent class :-P.

Allow *any* constant cast expression between pointers and longs,
or vice-versa, or any widening (not just same-size) conversion that
isLosslesslyConvertibleTo approves. This fixes oopack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7288 91177308-0d34-0410-b5e6-96231b3b80d8

Disable sample project until it works

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7287 91177308-0d34-0410-b5e6-96231b3b80d8

Add new tests, make existing tests more difficult

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7286 91177308-0d34-0410-b5e6-96231b3b80d8

Fix bug: FunctionResolve/2003-07-23-CPR-Reference.ll

This fixes a long time annoyance which caused prototypes for bzero, bcopy,
bcmp, fputs, and fputs_unlocked to never get deleted.  Grr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7285 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7284 91177308-0d34-0410-b5e6-96231b3b80d8

Add comments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7283 91177308-0d34-0410-b5e6-96231b3b80d8

Remove explicit check for: not (not X) = X, it is already handled because xor is commutative
  - InstCombine: (X & C1) ^ C2 --> (X & C1) | C2 iff (C1&C2) == 0
  - InstCombine: (X | C1) ^ C2 --> (X | C1) & ~C2 iff (C1&C2) == C2

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7282 91177308-0d34-0410-b5e6-96231b3b80d8

New testcases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7281 91177308-0d34-0410-b5e6-96231b3b80d8

Renumber tests sequentially

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7280 91177308-0d34-0410-b5e6-96231b3b80d8

Split the or and xor tests into two separate files

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7279 91177308-0d34-0410-b5e6-96231b3b80d8

Remove obscure test

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7278 91177308-0d34-0410-b5e6-96231b3b80d8

Check in old testcase sitting in my tree

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7277 91177308-0d34-0410-b5e6-96231b3b80d8

Fix program: SingleSource/UnitTests/2003-07-09-SignedArgs with the CBE

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7276 91177308-0d34-0410-b5e6-96231b3b80d8

Printer.cpp: Ditch addRequired/getAnalysis, because they leave
  Printer::doFinalization() out in the cold.  Now we pass in a TargetMachine
  to Printer's constructor and get the TargetData from the TargetMachine.
 Don't pass TargetMachine or MRegisterInfo objects around in the Printer.
 Constify TargetData references.
X86.h: Update comment and prototype of createX86CodePrinterPass().
X86TargetMachine.cpp: Update callers of createX86CodePrinterPass().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7275 91177308-0d34-0410-b5e6-96231b3b80d8

Make Module::getNamedFunction prefer non-external functions if there is more than
one function of the same name

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7274 91177308-0d34-0410-b5e6-96231b3b80d8

Fix space

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7273 91177308-0d34-0410-b5e6-96231b3b80d8

InstCombine: (X ^ C1) & C2 --> (X & C2) iff (C1&C2) == 0

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7272 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7271 91177308-0d34-0410-b5e6-96231b3b80d8

  - InstCombine: (X | C1) & C2 --> X & C2 iff C1 & C1 == 0
  - InstCombine: (X | C) & C --> C
  - InstCombine: (X | C1) & C2 --> (X | (C1&C2)) & C2

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7269 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7267 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7266 91177308-0d34-0410-b5e6-96231b3b80d8

Add, rewrite, and/or reformat many comments.

Stop passing ostreams around: we already have one perfectly good ostream
and we can all share it.

Stop stashing a pointer to TargetData in the Pass object, because that will
lead to a crash if there are no functions in the module (ouch!)  Instead,
use addRequired() and getAnalysis(), like we always should have done.

Move the check for ConstantExpr up before the check for isPrimitiveType,
because we need to be able to catch e.g. ubyte (cast bool false to ubyte),
whose type is primitive but which is nevertheless a ConstantExpr, by calling
our specialized handler instead of the AsmWriter. This would result in
assembler errors when we would try to output something like ".byte (cast
bool false to ubyte)".

GC some unused variable declarations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7265 91177308-0d34-0410-b5e6-96231b3b80d8

IC: (X & C1) | C2 --> (X | C2) & (C1|C2)
IC: (X ^ C1) | C2 --> (X | C2) ^ (C1&~C2)

We are now guaranteed that all 'or's will be inside of 'and's, and all 'and's
will be inside of 'xor's, if the second operands are constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7264 91177308-0d34-0410-b5e6-96231b3b80d8

New testcases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7263 91177308-0d34-0410-b5e6-96231b3b80d8

IC: (X ^ C1) & C2 --> (X & C2) ^ (C1&C2)
Minor code cleanup

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7262 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7261 91177308-0d34-0410-b5e6-96231b3b80d8

InstCombine: (X ^ 4) == 8  --> X == 12

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7260 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7259 91177308-0d34-0410-b5e6-96231b3b80d8

Add support for ~ operator on constants

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7258 91177308-0d34-0410-b5e6-96231b3b80d8

IC: (X & 5) == 13 --> false
IC: (X | 8) == 4  --> false

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7257 91177308-0d34-0410-b5e6-96231b3b80d8

New tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7256 91177308-0d34-0410-b5e6-96231b3b80d8

Renamed libtool to mklib for your tab completion pleasure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7255 91177308-0d34-0410-b5e6-96231b3b80d8

Remove redundant const qualifier

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7254 91177308-0d34-0410-b5e6-96231b3b80d8

Remove redundant const qualifiers from cast<> expressions

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7253 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify code by using ConstantInt::getRawValue instead of checking to see
whether the constant is signed or unsigned, then casting

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7252 91177308-0d34-0410-b5e6-96231b3b80d8

Remove unnecessary casts

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7250 91177308-0d34-0410-b5e6-96231b3b80d8

Fit code into 80 columns

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7249 91177308-0d34-0410-b5e6-96231b3b80d8

Eliminate old-style cast

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7248 91177308-0d34-0410-b5e6-96231b3b80d8

Random cleanups

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7247 91177308-0d34-0410-b5e6-96231b3b80d8

Remove using decl

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7246 91177308-0d34-0410-b5e6-96231b3b80d8

Remove explicit const qualifiers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7245 91177308-0d34-0410-b5e6-96231b3b80d8

Add more doxygen comments, add new ConstantInt::getRawValue method

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7244 91177308-0d34-0410-b5e6-96231b3b80d8

Fix bug: TailDup/2003-07-22-InfiniteLoop.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7243 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase that caused infinite loop in taildup

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7242 91177308-0d34-0410-b5e6-96231b3b80d8

  - InstCombine (cast (xor A, B) to bool) ==> (setne A, B)
  - InstCombine (cast (and X, (1 << size(X)-1)) to bool) ==> x < 0

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7241 91177308-0d34-0410-b5e6-96231b3b80d8

New testcases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7240 91177308-0d34-0410-b5e6-96231b3b80d8

Repaired the --enable and --disable options.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7239 91177308-0d34-0410-b5e6-96231b3b80d8

Fixed the enable/disable options.  The AC_ARG_ENABLE macro does not perform
the *action-if-not-given* code when the --disable option is used.
Rather, the AC_ARG_ENABLE macro sets the $enableval variable, which then needs
to be checked to determine if --enable, --disable, or neither was specified.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7238 91177308-0d34-0410-b5e6-96231b3b80d8

Add documentation for runOnMachineFunction()

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7237 91177308-0d34-0410-b5e6-96231b3b80d8

Made some corrections to the enable-llc_diffs option.
This should keep it from breaking for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7236 91177308-0d34-0410-b5e6-96231b3b80d8

Generated a new configure script.
This script uses files within the new autoconf subdirectory and includes
changes from Brian Gaeke's recent changes to configure.ac.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7235 91177308-0d34-0410-b5e6-96231b3b80d8