rusticl: do not DCE any samplers or textures

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19381>

src/gallium/frontends/rusticl/core/kernel.rs

@@ -452,6 +452,8 @@ extern "C" fn can_remove_var(var: *mut nir_variable, _: *mut c_void) -> bool {
     unsafe {
         let var = var.as_ref().unwrap();
         !glsl_type_is_image(var.type_)
+            && !glsl_type_is_texture(var.type_)
+            && !glsl_type_is_sampler(var.type_)
     }
 }