users_to_erase.push_back(user);
    }
    for (auto user : users_to_erase) rewriter.eraseOp(user);
    rewriter.eraseOp(call_op);
    func_op.eraseResult(0);
    func_op.insertResult(0, new_call_op.getResult(0).getType(),
                         /*resultAttrs=*/nullptr);

    // Modify the quantized fused function to do dequantize+relu(6).
    rewriter.setInsertionPoint(req_op);