[PATCH] [PowerPC] Fix unwind info with dynamic stack realignment

[Jay Foad]

- Add some comments prompted by Will.
- Refer to "call frame information" instead of "frame moves" or "machine moves".

http://reviews.llvm.org/D6410

Files:
  lib/Target/PowerPC/PPCFrameLowering.cpp
  test/CodeGen/PowerPC/stack-realign.ll
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