object = blackDequeue.pop();
object = blackDeque.pop();
  private final void scanBlack(VM_Address object)    throws VM_PragmaInline {    if (VM_Interface.VerifyAssertions)      VM_Interface._assert(blackDequeue.pop().isZero());    while (!object.isZero()) {      if (VM_Interface.VerifyAssertions)	VM_Interface._assert(!RCBaseHeader.isGreen(object));      if (!RCBaseHeader.isBlack(object)) {  // FIXME can't this just be if (isGrey(object)) ??	RCBaseHeader.makeBlack(object);	ScanObject.enumeratePointers(object, scanBlackEnum);      }      object = blackDequeue.pop();    }  }