intel/compiler: Lower texture operation to combine LOD and AI

We have to push the lowering of texture operations a bit further in
pipeline since nir_lower_tex gets invoked twice and if there is no LOD
source present, nir_lower_tex adds that as a source. Once that's all
done we can easily combine the LOD and array index into a single 32-bit
value.

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27458>

src/intel/compiler/brw_nir.c

@@ -1886,6 +1886,11 @@ brw_nir_apply_key(nir_shader *nir,
 
    OPT(brw_nir_apply_sampler_key, compiler, &key->tex);
 
+   const struct brw_nir_lower_texture_opts tex_opts = {
+      .combined_lod_and_array_index = compiler->devinfo->ver >= 20,
+   };
+   OPT(brw_nir_lower_texture, &tex_opts);
+
    const nir_lower_subgroups_options subgroups_options = {
       .subgroup_size = get_subgroup_size(&nir->info, max_subgroup_size),
       .ballot_bit_size = 32,