Clean up parser, fix a bug that prevented this from working:

Clean up parser, fix a bug that prevented this from working:

%ListNode3 = global %list { %list* null, int 4 }

because %list is name and the parser expected a literal {..} type there.

In addition, simplified rules that the fix (Allow any Types there, not just a StructType)
made obsolete.  Simplified type propogation a bit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@700 91177308-0d34-0410-b5e6-96231b3b80d8