Merge branch 'clang-handler' into 'main'

ROOT error handling: Explicitly load the atomic variable for the original handler

See merge request atlas/athena!71328

Control/RootUtils/src/WithRootErrorHandler.cxx

@@ -42,7 +42,7 @@ void errorHandler (int level,
     if (!rootErrorHandlers[i] (level, abort, location, msg)) return;
   }
   // They all returned true.  Call the previous handler.
-  origHandler (level, abort, location, msg);
+  origHandler.load() (level, abort, location, msg);
 }