tsan: fix darwin build

Runtime hooks do not seem to work on darwin. The test failed on builder:
http://lab.llvm.org:8080/green/job/clang-stage1-configure-RA_check/34882/consoleFull#7286766538254eaf0-7326-4999-85b0-388101f2d404
Move the test to Linux dir.

llvm-svn: 311776