ObjectReference tgt, int metaDataA,
ObjectReference tgt, Offset metaDataA,
  public final void writeBarrier(ObjectReference src, Address slot,                                 ObjectReference tgt, int metaDataA,                                  int metaDataB, int mode) throws InlinePragma {    TraceGenerator.processPointerUpdate(mode == PUTFIELD_WRITE_BARRIER,                                        src, slot, tgt);    Barriers.performWriteInBarrier(src, slot, tgt, metaDataA, metaDataB, mode);  }