concurrency runtime: fix unused variable/label warnings

Author: eeckstein

stdlib/public/Concurrency/Actor.cpp

@@ -695,6 +695,7 @@ class alignas(sizeof(void *) * 2) ActiveActorStatus {
     JobPriority currentPriority =
         JobPriority((Flags & concurrency::ActorFlagConstants::PriorityMask) >>
                     concurrency::ActorFlagConstants::PriorityShift);
+    (void)currentPriority;
     assert(priority > currentPriority);
 
     uint32_t flags =
@@ -1252,6 +1253,7 @@ static void defaultActorDrain(DefaultActorImpl *actor) {
   bool actorLockAcquired = actor->tryLock(true);
   // We always must succeed in taking the actor lock that we are draining
   // because we don't have to compete with OOL jobs. See ownership rule (3)
+  (void)actorLockAcquired;
   assert(actorLockAcquired);
 
   // Setup a TSD for tracking current execution info

stdlib/public/Concurrency/AsyncLet.cpp

@@ -154,6 +154,7 @@ void swift::asyncLet_addImpl(AsyncTask *task, AsyncLet *asyncLet,
         updateNewChildWithParentAndGroupState(task, parentStatus, NULL);
         return true;
       });
+  (void)addedRecord;
   assert(addedRecord);
 }
 

stdlib/public/Concurrency/TaskGroup.cpp

@@ -836,7 +836,9 @@ PollResult TaskGroupImpl::poll(AsyncTask *waitingTask) {
   bool hasSuspended = false;
   bool haveRunOneChildTaskInline = false;
 
+#if SWIFT_CONCURRENCY_TASK_TO_THREAD_MODEL
 reevaluate_if_taskgroup_has_results:;
+#endif
   auto assumed = statusMarkWaitingAssumeAcquire();
   if (haveRunOneChildTaskInline) {
     assert(assumed.readyTasks());