We might as well strip off any CPRs before propagation

    // Do we have a constant argument!?

    if (!ArgumentConstants[i].second) {

      assert(ArgumentConstants[i].first && "Unknown constant value!");

      AI->replaceAllUsesWith(ArgumentConstants[i].first);

      Value *V = ArgumentConstants[i].first;

      if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(V))

        V = CPR->getValue();

      AI->replaceAllUsesWith(V);

      ++NumArgumentsProped;

    }

  return true;