message: added coroutine_num to server->stats
diff: @@ -2883,6 +2883,10 @@ PHP_METHOD(swoole_server, stats)
  sw_add_assoc_long_ex(return_value, ZEND_STRS("task_queue_bytes"), queue_bytes);
  }
  }
  +
  +#ifdef SW_COROUTINE
  + sw_add_assoc_long_ex(return_value, ZEND_STRS("coroutine_num"), COROG->coro_num);
  +#endif
  }
  PHP_METHOD(swoole_server, reload)
  