Concurrency: clean up a log message (NFC)

This simply cleans up the logged message when debug tracing is enabled.

Author: compnerd

stdlib/public/Concurrency/Actor.cpp

@@ -1537,7 +1537,7 @@ static void swift_job_runImpl(Job *job, ExecutorRef executor) {
   trackingInfo.enterAndShadow(executor);
   auto traceHandle = concurrency::trace::job_run_begin(job, &executor);
 
-  SWIFT_TASK_DEBUG_LOG("%s(%p)", __func__, job);
+  SWIFT_TASK_DEBUG_LOG("job %p", job);
   runJobInEstablishedExecutorContext(job);
 
   concurrency::trace::job_run_end(&executor, traceHandle);