[PATCH] [compiler-rt] fix and simplify GetMaxVirtualAddress for ppc64*

[Will Schmidt]

Reworked to use GET_CURRENT_FRAME and MostSignificantSetBitIndex helper functions per previous comments.

http://reviews.llvm.org/D6044

Files:
  lib/asan/asan_mapping.h
  lib/sanitizer_common/sanitizer_posix.cc
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