[tsan] Fix __cxa_guard_* interceptors on OS X

This patch fixes the __cxa_guard_acquire, __cxa_guard_release and __cxa_guard_abort interceptors on OS X. They apparently work on Linux just by having the same name, but on OS X, we actually need to use TSAN_INTERCEPTOR.

Differential Revision: http://reviews.llvm.org/D14868

llvm-svn: 253776