cleanup for freestanding mode

Author: ktoso

stdlib/public/Concurrency/TaskGroup.cpp

@@ -660,7 +660,7 @@ void TaskGroupBase::runWaitingTask(PreparedWaitingTask prepared) {
   assert(prepared.waitingTask == nullptr &&
          "unexpected task to schedule in TASK_TO_THREAD_MODEL!"
          "In this mode we should have run the task in-line, "
-         "rather than return it for scheduling.")
+         "rather than return it for scheduling.");
 #endif
   if (auto waitingTask = prepared.waitingTask) {
     // TODO: allow the caller to suggest an executor

stdlib/public/Concurrency/TaskPrivate.h

@@ -781,8 +781,10 @@ struct AsyncTask::PrivateStorage {
 
   // Destroy the opaque storage of the task
   void destroy() {
+#ifndef NDEBUG
     auto oldStatus = _status().load(std::memory_order_relaxed);
     assert(oldStatus.isComplete());
+#endif
 
     this->~PrivateStorage();
   }