numYields = 0;
  public void update(int whereFrom) {    int yp = VM_Synchronization.fetchAndAdd(this, VM_Entrypoints.yieldCountListenerNumYieldsField.getOffset(), 1) + 1;    if (yp == yieldThreshold) {      totalYields += yp;      numYields = 0;      activateOrganizer();    }  }