Merge pull request #38601 from varungandhi-apple/vg-5.5-resume-to-generic-executor

[5.5] [Runtime] Resume to the generic executor in the absence of an override.

Author: DougGregor

stdlib/public/Concurrency/Task.cpp

@@ -953,7 +953,7 @@ static AsyncTask *swift_continuation_initImpl(ContinuationAsyncContext *context,
   // Set the current executor as the target executor unless there's
   // an executor override.
   if (!flags.hasExecutorOverride())
-    context->ResumeToExecutor = swift_task_getCurrentExecutor();
+    context->ResumeToExecutor = ExecutorRef::generic();
 
   // We can initialize this with a relaxed store because resumption
   // must happen-after this call.