// and the current argument is erased, so here we always process the first
    // argument in the list.
    auto arg = bb.getArgument(0);

    auto remove_quantize_op = [&](QuantizeOp quantize_op) {
      auto quantize_output = quantize_op.getOutput();
      auto quantize_type = quantize_output.getType();
      input_types.push_back(quantize_type);