[IoContext] die when the completer threads reaps new work notifications

The PipeSleepStrategy uses the invariant that the completer thread is not reaping IoContext of workers which have a read of the sleep/notification pipe in flight. This means that it can not reap CQEs resulting from such reads. To esnure this invariant we DIE if the completer encounters completions for such notifications.

emper/io/IoContext.cpp

@@ -318,8 +318,11 @@ reap_cqes:
 		switch (tag) {
 			case PointerTags::NewWorkWsq:
 			case PointerTags::NewWorkAq: {
-				LOGD("Got new work notification");
+				if constexpr (callerEnvironment == CallerEnvironment::ANYWHERE) {
+					DIE_MSG("Completer reaping new work notification");
+				}
 
+				LOGD("Got new work notification");
 				auto *pipeSleepStrategy =
 						reinterpret_cast<PipeSleepStrategy *>(&runtime.getWorkerSleepStrategy());
 				statsIncr(pipeSleepStrategy->stats->wakeupDueToNotify);