panfrost: Use nir_foreach_variable_with_modes in pan_compile

Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5966>
diff --git a/src/gallium/drivers/panfrost/pan_assemble.c b/src/gallium/drivers/panfrost/pan_assemble.c
index 64e67ae..4a3bf79 100644
--- a/src/gallium/drivers/panfrost/pan_assemble.c
+++ b/src/gallium/drivers/panfrost/pan_assemble.c
@@ -274,10 +274,10 @@
 
         /* Record the varying mapping for the command stream's bookkeeping */
 
-        struct exec_list *l_varyings =
-                        stage == MESA_SHADER_VERTEX ? &s->outputs : &s->inputs;
+        nir_variable_mode varying_mode =
+                        stage == MESA_SHADER_VERTEX ? nir_var_shader_out : nir_var_shader_in;
 
-        nir_foreach_variable(var, l_varyings) {
+        nir_foreach_variable_with_modes(var, s, varying_mode) {
                 unsigned loc = var->data.driver_location;
                 unsigned sz = glsl_count_attribute_slots(var->type, FALSE);