VM_Magic.setLongAtOffset(obj, offset, value);
VM_Magic.setLongAtOffset(obj, getOffset(), value);
  private void put64(Object obj, long value) {    if (isStatic()) {      VM_Statics.setSlotContents(offset >>> LOG_BYTES_IN_INT, value);    } else {      VM_Magic.setLongAtOffset(obj, offset, value);    }  }