workDequeue.push(object);
workDeque.push(object);
  final void enumerateGrey(VM_Address object)    throws VM_PragmaInline {    if (Plan.isRCObject(object) && !RCBaseHeader.isGreen(object)) {      if (VM_Interface.VerifyAssertions)	VM_Interface._assert(RCBaseHeader.isLiveRC(object));      RCBaseHeader.decRC(object, false);      workDequeue.push(object);    }  }