[libcxx] Enable building and testing of libcxx with ThreadSanitizer on OS X
This patch enables building and testing libcxx under ThreadSanitizer on OS X. CMake builds that have -DLLVM_USE_SANITIZER=Thread will automatically build libcxx with -fsanitize=thread and testing via lit then runs under TSan. Differential Revision: https://reviews.llvm.org/D24297 llvm-svn: 281475
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