if (VM.VerifyAssertions) VM._assert(r.isIntLike(), r.toString());
if (VM.VerifyAssertions) VM._assert(r.isIntLike());
  OPT_Operand popInt() {    OPT_Operand r = pop();    if (VM.VerifyAssertions) VM._assert(r.isIntLike(), r.toString());    return r;  }