Function get_litert_value

kleidiai-examples/audiogen/app/audiogen.cpp:141–148

template <typename T>
static T get_litert_value(litert::Expected<T>&& value) {
    AUDIOGEN_CHECK(value);
    if constexpr (std::is_reference_v<T>) {
        return *value;
    } else {
        return std::move(*value);
    }
}

static size_t get_num_elems(const litert::RankedTensorType& type) {
    return get_litert_value(type.Layout().NumElements());