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

[Jay Foad]

Move the comment as suggested by Will. It got a bit more verbose because
I wanted to be clear that "stack was realigned" implies HasBP, but not
vice versa.

http://reviews.llvm.org/D6410

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