SimpleRCHeader.makeBlack(object); ScanObject.scan(object);
if (!SimpleRCBaseHeader.isGreen(object)) { SimpleRCBaseHeader.makeBlack(object); ScanObject.scan(object); }
  public final void scanBlack(VM_Address object)     throws VM_PragmaInline {    while (!object.isZero()) {      SimpleRCHeader.makeBlack(object);      ScanObject.scan(object);      object = blackQueue.pop();    }  }