blackDequeue.push(object);
blackDeque.push(object);
  final void enumerateScanBlack(VM_Address object)    throws VM_PragmaInline {    if (Plan.isRCObject(object) && !RCBaseHeader.isGreen(object)) {      RCBaseHeader.incRC(object, false);      if (!RCBaseHeader.isBlack(object))	blackDequeue.push(object);    }  }