[PATCH] [ARM] Fix large stack alignment codegen bug for ARM and Thumb2 targets

[Kristof Beyls]

Thanks James, I've updated the patch taking into account your review comments.
The only comment I didn't make a change for is commenting whether Alignment is a log2 value or not, as I feel that that documentation would be overkill - it isn't a log2 value and it should be clear from the context it isn't.


http://reviews.llvm.org/D6844

Files:
  lib/Target/ARM/ARMExpandPseudoInsts.cpp
  lib/Target/ARM/ARMFrameLowering.cpp
  test/CodeGen/ARM/alloc-no-stack-realign.ll
  test/CodeGen/ARM/fold-stack-adjust.ll
  test/CodeGen/ARM/interrupt-attr.ll
  test/CodeGen/ARM/spill-q.ll
  test/CodeGen/ARM/stack-alignment.ll
  test/CodeGen/Thumb2/aligned-spill.ll
  test/CodeGen/Thumb2/thumb2-spill-q.ll

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