[PATCH] asan: fix atomic operations on ARM

[Dmitry Vyukov]

  add 2 separate files for x86 and other platforms
  instead of ifdef spaghetti

Hi eugenis,

http://llvm-reviews.chandlerc.com/D2582

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2582?vs=6543&id=6544#toc

Files:
  lib/asan/asan_allocator.h
  lib/sanitizer_common/sanitizer_atomic.h
  lib/sanitizer_common/sanitizer_atomic_clang.h
  lib/sanitizer_common/tests/sanitizer_atomic_test.cc
  lib/sanitizer_common/sanitizer_atomic_clang_x86.h
  lib/sanitizer_common/sanitizer_atomic_clang_other.h
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