VM.assert(n <= NUMBER_INT_PARAM);
VM._assert(n <= NUMBER_INT_PARAM);
  Enumeration enumerateGPRParameters(int n) {    if (VM.VerifyAssertions)      VM.assert(n <= NUMBER_INT_PARAM);    return new PhysicalRegisterEnumeration(FIRST_INT_PARAM,                                           FIRST_INT_PARAM + n - 1);  }