if (op instanceof OPT_LongConstantOperand) return Address.fromLong(op.asLongConstant().value);
  private static Address getAddressValue(OPT_Operand op) {    if (op instanceof OPT_NullConstantOperand)       return Address.zero();    if (op instanceof OPT_AddressConstantOperand)      return op.asAddressConstant().value;     if (op instanceof OPT_IntConstantOperand)      return Address.fromIntSignExtend(op.asIntConstant().value);    //-#if RVM_FOR_64_ADDR     if (op instanceof OPT_LongConstantOperand)      return Address.fromLong(op.asLongConstant().value);    //-#endif    throw new OPT_OptimizingCompilerException("Cannot getAddressValue from this operand " + op);  }