if (VM.VerifyAssertions && VM.runningVM) VM.assert(VM.NOT_REACHED);
if (VM.VerifyAssertions && VM.runningVM) VM._assert(VM.NOT_REACHED);
  public boolean isZero() {    if (VM.VerifyAssertions && VM.runningVM) VM.assert(VM.NOT_REACHED);  // call site should have been hijacked by magic in compiler    return EQ(zero());  }