Method add_instruction_stream

test/analyze_streams.cpp:118–124

    template <class... Ts>
    migraphx::instruction_ref add_instruction_stream(std::size_t n, Ts... xs)
    {
        max_stream      = std::max(max_stream, n);
        auto ins        = mm->add_instruction(xs...);
        ins2stream[ins] = n;
        return ins;
    }

    template <class... Ts>
    migraphx::instruction_ref add_return(Ts... xs)