nir: add missed nir_cmp_imm-helpers

Seems I missed these in my previous round, let's fix them up now!

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23461>

src/intel/compiler/brw_nir_lower_rt_intrinsics.c

@@ -39,8 +39,8 @@ build_leaf_is_procedural(nir_builder *b, struct brw_nir_rt_mem_hit_defs *hit)
       return nir_imm_true(b);
 
    default:
-      return nir_ieq(b, hit->leaf_type,
-                        nir_imm_int(b, BRW_RT_BVH_NODE_TYPE_PROCEDURAL));
+      return nir_ieq_imm(b, hit->leaf_type,
+                            BRW_RT_BVH_NODE_TYPE_PROCEDURAL);
    }
 }