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

[Will Schmidt]

Hi kcc, samsonov, wschmidt,

Use __builtin_frame_address(0) to calculate the memory layout for power.  This works for both PPC64 endian-ness modes, so also eliminates the need for the BIG_ENDIAN/LITTLE_ENDIAN checks.

By trial and error, it also looks like the kPPC64_ShadowOffset64 value is (1ULL << 41) for both BE and LE, so that #if/#elif/#endif block has also been simplified.

http://reviews.llvm.org/D6044

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