[tsan] Enable ThreadSanitizer on OS X builds by default, take 2

Second attempt to enable building ThreadSanitizer (and running tests) on OS X by default.

Differential Revision: http://reviews.llvm.org/D15109

llvm-svn: 254603

compiler-rt/cmake/config-ix.cmake

@@ -560,19 +560,12 @@ else()
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND TSAN_SUPPORTED_ARCH AND
-    OS_NAME MATCHES "Linux|FreeBSD")
+    OS_NAME MATCHES "Darwin|Linux|FreeBSD")
   set(COMPILER_RT_HAS_TSAN TRUE)
 else()
   set(COMPILER_RT_HAS_TSAN FALSE)
 endif()
 
-if(APPLE)
-  option(COMPILER_RT_ENABLE_TSAN_OSX "Enable building TSan for OS X - Experimental" Off)
-  if(COMPILER_RT_ENABLE_TSAN_OSX)
-    set(COMPILER_RT_HAS_TSAN TRUE)
-  endif()
-endif()
-
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND UBSAN_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Darwin|Linux|FreeBSD|Windows")
   set(COMPILER_RT_HAS_UBSAN TRUE)