[tsan] Enable building and testing TSan Go runtime on OS X

[kubamracek]

Summary

The build and test actually work now, so let's just enable them.

lib/tsan/CMakeLists.txt

OBJECT_LIBS RTInterception
                 RTUbsan
     CFLAGS ${TSAN_RTL_CFLAGS}
     PARENT_TARGET tsan)
   add_compiler_rt_object_libraries(RTTsan_dynamic 
     OS ${TSAN_SUPPORTED_OS}
     ARCHS ${TSAN_SUPPORTED_ARCH}
     SOURCES ${TSAN_SOURCES} ${TSAN_CXX_SOURCES} ${TSAN_ASM_SOURCES}
     CFLAGS ${TSAN_RTL_CFLAGS})
+
+  # Build and check Go runtime.
+  set(BUILDGO_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/go/buildgo.sh)
+  add_custom_target(GotsanRuntimeCheck
+    COMMAND env "CC=${CMAKE_C_COMPILER} ${OSX_SYSROOT_FLAG}"
+            IN_TMPDIR=1 SILENT=1 ${BUILDGO_SCRIPT}
+    DEPENDS tsan ${BUILDGO_SCRIPT}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/go
+    COMMENT "Checking TSan Go runtime..."
+    VERBATIM)
 else()
   foreach(arch ${TSAN_SUPPORTED_ARCH})
     if(arch STREQUAL "x86_64")
       set(TSAN_ASM_SOURCES rtl/tsan_rtl_amd64.S)
       # Pass ASM file directly to the C++ compiler.
       set_source_files_properties(${TSAN_ASM_SOURCES} PROPERTIES
         LANGUAGE C)
       # Sanity check for Go runtime.

test/tsan/CMakeLists.txt

 set(TSAN_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS})
-if(NOT ${COMPILER_RT_DEFAULT_TARGET_ARCH} MATCHES "mips" AND NOT APPLE)
+if(NOT ${COMPILER_RT_DEFAULT_TARGET_ARCH} MATCHES "mips")
   list(APPEND TSAN_TEST_DEPS GotsanRuntimeCheck)
 endif()
 if(NOT COMPILER_RT_STANDALONE_BUILD)
   list(APPEND TSAN_TEST_DEPS tsan)
 endif()
 if(COMPILER_RT_HAS_LIBCXX_SOURCES AND
    COMPILER_RT_TEST_COMPILER_ID STREQUAL "Clang"
    AND NOT APPLE)