void CollectedHeap::accumulate_statistics_all_tlabs() {

  {- -------------------------------------------
  (1) ThreadLocalAllocBuffer::accumulate_statistics_before_gc() を呼び出すだけ.
      (なお, UseTLAB オプションが指定されていない場合には何もしない)
      ---------------------------------------- -}

      if (UseTLAB) {
        assert(SafepointSynchronize::is_at_safepoint() ||
             !is_init_completed(),
             "should only accumulate statistics on tlabs at safepoint");

        ThreadLocalAllocBuffer::accumulate_statistics_before_gc();
      }
    }