[PATCH] [asan] Implement delayed activation of AddressSanitizer

[Evgeniy Stepanov]

  Added namespace and a FIXME for non-atomic flag update.

Hi kcc, samsonov, glider, dvyukov,

http://llvm-reviews.chandlerc.com/D2553

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2553?vs=6462&id=6491#toc

Files:
  lib/asan/lit_tests/TestCases/start-deactivated.cc
  lib/asan/lit_tests/TestCases/SharedLibs/start-deactivated-so.cc
  lib/asan/asan_malloc_mac.cc
  lib/asan/asan_rtl.cc
  lib/asan/asan_allocator2.cc
  lib/asan/asan_internal.h
  lib/asan/asan_interceptors.cc
  lib/asan/CMakeLists.txt
  lib/asan/asan_flags.h
  lib/asan/asan_activation.cc
  lib/asan/asan_activation.h
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