if (VM.VerifyAssertions) VM.assert(populationCount(index) == 1);
if (VM.VerifyAssertions) VM._assert(populationCount(index) == 1);
    private VM_Method getSoleTarget(int index) {      if (VM.VerifyAssertions) VM.assert(populationCount(index) == 1);      return links[index].method;    }