compiler error notes: Clang constexpr variable lifetime about nmtools

[alifahrri]

error message: https://github.com/alifahrri/nmtools/actions/runs/3811800301/jobs/6484666756

/work/tests/array/index/reshape.cpp:639:5: error: constexpr variable 'result' must be initialized by a constant expression
    CONSTEXPR_SHAPE_RESHAPE_SUBCASE( case5, shape, newshape_ct );
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/work/tests/array/index/reshape.cpp:377:20: note: expanded from macro 'CONSTEXPR_SHAPE_RESHAPE_SUBCASE'
    constexpr auto result = RUN_impl(__VA_ARGS__); \
                   ^        ~~~~~~~~~~~~~~~~~~~~~
/work/include/nmtools/array/index/reshape.hpp:21:30: note: read of variable whose lifetime has ended
            const auto d_i = at(dst_shape,i);
                             ^
/work/include/nmtools/array/index/reshape.hpp:77:53: note: in call to 'count_negative_reshape(newshape_ct)'
            const auto [minus_1_count, dst_numel] = count_negative_reshape(dst_shape);
                                                    ^

related code: https://github.com/alifahrri/nmtools/blob/clang-compile-error-constexpr-variable-lifetime-2/include/nmtools/array/index/reshape.hpp#L21

    template <typename dst_shape_t>
    constexpr auto count_negative_reshape(const dst_shape_t& dst_shape)
    {
        auto minus_1_count = 0;
        auto dst_numel = (size_t)0;
        using index_t = meta::get_index_element_type_t<dst_shape_t>;
        for (size_t i=0; i<len(dst_shape); i++) {
            const auto d_i = at(dst_shape,i);
            if (i==0) {
                dst_numel = 1;
            }

works just fine on gcc: https://github.com/alifahrri/nmtools/actions/runs/3811800303/jobs/6484666704

[alifahrri]

fixed in #216