microsoft/spirv_to_dxil: turn sysvals into input varyings

Fixes: b47090c5b3 ("spirv: Always declare FragCoord as a sysval")
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13276>

src/microsoft/spirv_to_dxil/spirv_to_dxil.c

@@ -194,6 +194,12 @@ spirv_to_dxil(const uint32_t *words, size_t word_count,
    nir_validate_shader(nir,
                        "Validate before feeding NIR to the DXIL compiler");
 
+   const struct nir_lower_sysvals_to_varyings_options sysvals_to_varyings = {
+      .frag_coord = true,
+      .point_coord = true,
+   };
+   NIR_PASS_V(nir, nir_lower_sysvals_to_varyings, &sysvals_to_varyings);
+
    NIR_PASS_V(nir, nir_lower_system_values);
 
    if (conf->zero_based_vertex_instance_id) {