Reference.reachabilityFence(o);
    }
  }

  private static final boolean IS_REACHABILITY_FENCE_METHOD_USABLE =
      computeIsReachabilityFenceMethodUsable();

  private static boolean computeIsReachabilityFenceMethodUsable() {
    try {
      Method method = Reference.class.getMethod("reachabilityFence", Object.class);