Avoid double-checked locking with TSAN in parallel

Omit the first check of the double-checked locking pattern in
recordException() in parallel.cpp when CV_THREAD_SANITIZER is defined.
This should only slow recordException() down when the thread sanitizer
is used, and avoids the TSAN data race warning.

modules/core/src/parallel.cpp

@@ -263,7 +263,9 @@ namespace {
         void recordException(const cv::String& msg)
 #endif
         {
+#ifndef CV_THREAD_SANITIZER
             if (!hasException)
+#endif
             {
                 cv::AutoLock lock(cv::getInitializationMutex());
                 if (!hasException)