message: 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.
diff: @@ -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)
  