bool AliasSetTracker::add(CallSite CS) {
  if (Function *F = CS.getCalledFunction())
    if (AA.doesNotAccessMemory(F))
      return true; // doesn't alias anything

  AliasSet *AS = findAliasSetForCallSite(CS);
  if (!AS) {
    AliasSets.push_back(new AliasSet());
    AS = &AliasSets.back();
    AS->addCallSite(CS, AA);
    return true;
  } else {
    AS->addCallSite(CS, AA);
    return false;
  }
}
bool AliasSetTracker::add(CallSite CS) {
  if (isa<DbgInfoIntrinsic>(CS.getInstruction())) 
    return true; // Ignore DbgInfo Intrinsics.
  if (AA.doesNotAccessMemory(CS))
    return true; // doesn't alias anything

  AliasSet *AS = findAliasSetForCallSite(CS);
  if (AS) {
    AS->addCallSite(CS, AA);
    return false;
  }
  AliasSets.push_back(new AliasSet());
  AS = &AliasSets.back();
  AS->addCallSite(CS, AA);
  return true;
}