s.insertBefore(Move.create(LONG_MOVE, rop, addr));
s.insertBefore(Move.create(REF_MOVE, rop, addr));
  static OPT_Operand asRegLong(OPT_Operand addr,                           OPT_Instruction s,                           OPT_IR ir) {    if (addr instanceof OPT_LongConstantOperand) {      OPT_RegisterOperand rop = ir.regpool.makeTempLong();      s.insertBefore(Move.create(LONG_MOVE, rop, addr));      return rop.copyD2U();    }    // Operand was OK as is.    return addr;  }