[PATCH] asan: fix atomic operations on ARM

[Dmitry Vyukov]

Hi eugenis,

implement correct atomic load/store for ARM
add test for atomic load/store


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

Files:
  lib/sanitizer_common/sanitizer_atomic.h
  lib/sanitizer_common/sanitizer_atomic_clang.h
  lib/sanitizer_common/tests/sanitizer_atomic_test.cc
  lib/asan/asan_allocator.h
  CMakeLists.txt
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