[PATCH] [PowerPC]Adapt fast stack unwinding to work for Power.

[Bill Seurer]

Updated comments to better explain popping of stack frames.


http://reviews.llvm.org/D9259

Files:
  /home/seurer/llvm/llvm-test/projects/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
  /home/seurer/llvm/llvm-test/projects/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
  /home/seurer/llvm/llvm-test/projects/compiler-rt/lib/sanitizer_common/sanitizer_unwind_posix_libcdep.cc

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