[PATCH] StopTheWorld in sanitizer_common (first commit)

[Sergey Matveev]

Hi kcc, samsonov, glider,

StopTheWorld puts the process in a suspended state before running the
user-supplied callback. To be used in TSan and in leak checking code.

Linux implementation provided.

http://llvm-reviews.chandlerc.com/D469

Files:
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/sanitizer_common.cc
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_stoptheworld.h
  lib/sanitizer_common/sanitizer_stoptheworld_linux.cc
  lib/sanitizer_common/tests/CMakeLists.txt
  lib/sanitizer_common/tests/sanitizer_stoptheworld_test.cc
  lib/sanitizer_common/tests/sanitizer_stoptheworld_testlib.cc
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