Assert that recursive logging should not occur in debug systems

src/hotspot/share/logging/logAsyncWriter.cpp

@@ -100,6 +100,7 @@ bool AsyncLogWriter::resort_to_synchronous_logging() {
   Thread* this_thread = Thread::current_or_null();
   bool is_async_log_thread = this_thread != nullptr && alw == this_thread;
   bool is_recursively_logging = this_thread != nullptr && holding_thread == this_thread;
+  assert(!is_recursively_logging, "Do not log while holding the Async log lock");
   return is_async_log_thread    ||  // The async log producer is attempting to log, leading to recursive logging.
          is_recursively_logging ||  // A thread enqueuing a message has attempted to log something.
          alw == nullptr         ||  // There is no AsyncLogWriter instance yet.