bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) {

  {- -------------------------------------------
  (1) (verify)
      ---------------------------------------- -}

      NOT_PRODUCT(verify_ok_to_handle_reflists());

  {- -------------------------------------------
  (1) ReferenceProcessor::enqueue_discovered_ref_helper() を呼び出すだけ.
      ---------------------------------------- -}

      if (UseCompressedOops) {
        return enqueue_discovered_ref_helper<narrowOop>(this, task_executor);
      } else {
        return enqueue_discovered_ref_helper<oop>(this, task_executor);
      }
    }