[sanitizer] Fix darwin Go tsan build by unifying r281567 and r281553.

Avoid redefining the weak stub when building gotsan.cc

llvm-svn: 281576

compiler-rt/lib/sanitizer_common/sanitizer_common.cc

@@ -488,4 +488,11 @@ int __sanitizer_install_malloc_and_free_hooks(void (*malloc_hook)(const void *,
                                               void (*free_hook)(const void *)) {
   return InstallMallocFreeHooks(malloc_hook, free_hook);
 }
+
+#if !SANITIZER_SUPPORTS_WEAK_HOOKS
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+void __sanitizer_print_memory_profile(int top_percent) {
+  (void)top_percent;
+}
+#endif
 } // extern "C"

compiler-rt/lib/sanitizer_common/sanitizer_mac.cc

@@ -747,12 +747,4 @@ void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) { }
 
 }  // namespace __sanitizer
 
-extern "C" {
-// Provide a definition on mac, where 'weak' symbols don't behave like on linux.
-SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
-void __sanitizer_print_memory_profile(int top_percent) {
-  (void)top_percent;
-}
-} // extern "C"
-
 #endif  // SANITIZER_MAC

compiler-rt/lib/tsan/rtl/tsan_rtl.cc

@@ -42,8 +42,6 @@ extern "C" void __tsan_resume() {
   __tsan_resumed = 1;
 }
 
-extern "C" void __sanitizer_print_memory_profile(int percent) {}  // Stub.
-
 namespace __tsan {
 
 #if !defined(SANITIZER_GO) && !SANITIZER_MAC