zink: add a pipeline shortcut for basic compute programs

if there are no inline uniforms, nonseamless cubes, or local size use,
then this is the "base" pipeline object that can be reused without checking
the hash table

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18197>

src/gallium/drivers/zink/zink_program.c

@@ -967,6 +967,10 @@ zink_get_compute_pipeline(struct zink_screen *screen,
       state->dirty = false;
       state->final_hash ^= state->hash;
    }
+   if (!comp->use_local_size && !comp->curr->num_uniforms && !comp->curr->has_nonseamless && comp->base_pipeline) {
+      state->pipeline = comp->base_pipeline;
+      return state->pipeline;
+   }
    entry = _mesa_hash_table_search_pre_hashed(comp->pipelines, state->final_hash, state);
 
    if (!entry) {
@@ -985,6 +989,8 @@ zink_get_compute_pipeline(struct zink_screen *screen,
 
       entry = _mesa_hash_table_insert_pre_hashed(comp->pipelines, state->final_hash, pc_entry, pc_entry);
       assert(entry);
+      if (!comp->use_local_size && !comp->curr->num_uniforms && !comp->curr->has_nonseamless)
+         comp->base_pipeline = pipeline;
    }
 
    struct compute_pipeline_cache_entry *cache_entry = entry->data;

src/gallium/drivers/zink/zink_types.h

@@ -813,6 +813,8 @@ struct zink_compute_program {
 
    struct zink_shader *shader;
    struct hash_table *pipelines;
+
+   VkPipeline base_pipeline;
 };