d3d12: Use DXIL load/store lowering pass

Reviewed-by: Sil Vilerino <sivileri@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14294>

src/gallium/drivers/d3d12/d3d12_compiler.cpp

@@ -173,6 +173,7 @@ compile_nir(struct d3d12_context *ctx, struct d3d12_shader_selector *sel,
    NIR_PASS_V(nir, d3d12_lower_load_first_vertex);
    NIR_PASS_V(nir, d3d12_lower_state_vars, shader);
    NIR_PASS_V(nir, dxil_nir_lower_bool_input);
+   NIR_PASS_V(nir, dxil_nir_lower_loads_stores_to_dxil);
 
    struct nir_to_dxil_options opts = {};
    opts.interpolate_at_vertex = screen->have_load_at_vertex;