intel/fs: handle interpolation modes for at_sample and at_offset too

Cc: mesa-stable

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15424>

src/intel/compiler/brw_fs.cpp

@@ -9500,6 +9500,8 @@ brw_compute_barycentric_interp_modes(const struct intel_device_info *devinfo,
             case nir_intrinsic_load_barycentric_pixel:
             case nir_intrinsic_load_barycentric_centroid:
             case nir_intrinsic_load_barycentric_sample:
+            case nir_intrinsic_load_barycentric_at_sample:
+            case nir_intrinsic_load_barycentric_at_offset:
                break;
             default:
                continue;