void VM_G1CollectForAllocation::doit() {

  {- -------------------------------------------
  (1) G1CollectedHeap::satisfy_failed_allocation() を呼び出すだけ.
      ---------------------------------------- -}

      G1CollectedHeap* g1h = G1CollectedHeap::heap();
      _result = g1h->satisfy_failed_allocation(_word_size, &_pause_succeeded);

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert(_result == NULL || _pause_succeeded,
             "if we get back a result, the pause should have succeeded");
    }