[PATCH] [Tsan] Fix the atomic_race.cc test to pass on systems with high loads

[Viktor Kutuzov]

Hi kcc, samsonov, glider, dvyukov,

The current delay duration is too short for the FreeBSD buildbot slave:

http://lab.llvm.org:8011/buildslaves/as-bldslv5

that serves several FreeBSD buildbots:

http://lab.llvm.org:8011/builders/sanitizer_x86_64-freebsd
http://lab.llvm.org:8011/builders/lld-x86_64-freebsd
http://lab.llvm.org:8011/builders/clang-mergefunc-x86_64-freebsd

and runs the lit tests in 64 threads (which is what lit.py does by default on this machine). Due to this insufficient delay the output for the reverse tests come before the output for the ordinary ones. It seems with four-second delay we pass this test persistently.

http://reviews.llvm.org/D6478

Files:
  test/tsan/atomic_race.cc
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