[PATCH] [Thumb1] Re-write emitThumbRegPlusImmediate

[Oliver Stannard]

Add an extra assertion to catch the case where RangeAfterCopy is not aligned, but CopyOpc requires an aligned immediate.

http://reviews.llvm.org/D6211

Files:
  include/llvm/Support/MathExtras.h
  lib/Target/ARM/Thumb1RegisterInfo.cpp
  test/CodeGen/ARM/thumb1-varalloc.ll
  test/CodeGen/Thumb/large-stack.ll
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