Make sure rtsan gets initialized on mac

Author: cjappl

compiler-rt/lib/rtsan/rtsan_interceptors.cpp

@@ -39,7 +39,6 @@
 
 using namespace __sanitizer;
 
-using __rtsan::rtsan_init_is_running;
 using __rtsan::rtsan_initialized;
 
 namespace {
@@ -49,6 +48,9 @@ struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
 } // namespace
 
 void ExpectNotRealtime(const char *intercepted_function_name) {
+  if (!rtsan_initialized)
+    __rtsan_init();
+
   __rtsan::GetContextForThisThread().ExpectNotRealtime(
       intercepted_function_name);
 }