[PATCH] ARM: fold stack update into push/pop

[Tim Northover]

  Applied Renato's suggestions.

Hi grosbach,

http://llvm-reviews.chandlerc.com/D2105

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2105?vs=5362&id=5383#toc

Files:
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  lib/Target/ARM/ARMBaseInstrInfo.h
  lib/Target/ARM/ARMFrameLowering.cpp
  lib/Target/ARM/Thumb1FrameLowering.cpp
  test/CodeGen/ARM/fold-stack-adjust.ll
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