if (VM.VerifyAssertions) VM._assert(VM.BuildFor64Addr);
  public static Word fromLong(long val) throws UninterruptibleNoWarnPragma {    if (VM.VerifyAssertions) VM._assert(VM.BuildFor64Addr);    if (VM.VerifyAssertions && VM.runningVM) VM._assert(VM.NOT_REACHED);    return new Word(val);  }