Update local stack block allocation to let PEI do the allocs if no additional

Update local stack block allocation to let PEI do the allocs if no additional
base registers were required. This will allow for slightly better packing
of the locals when alignment padding is necessary after callee saved registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111508 91177308-0d34-0410-b5e6-96231b3b80d8