flushFreeLists();
  public final void release() {    if (Plan.verbose > 2) processIncBufsAndCount(); else processIncBufs();    VM_CollectorThread.gcBarrier.rendezvous();    if (Plan.verbose > 2) processDecBufsAndCount(); else processDecBufs();    if (Plan.refCountCycleDetection) {      cycleDetector.collectCycles();      if (Plan.verbose > 2) processDecBufsAndCount(); else processDecBufs();    }    restoreFreeLists();        if (Plan.sanityTracing) rcSanityCheck();  }