anv: Flatten descriptor bindings in anv_nir_apply_pipeline_layout

This lets us stop tracking the pipeline layout.  It also means less
indirection on a very hot path.  As an extra bonus, we can make some of
our data structures smaller.  No measurable CPU overhead improvement.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_cmd_buffer.c

@@ -614,14 +614,6 @@ anv_cmd_buffer_bind_descriptor_set(struct anv_cmd_buffer *cmd_buffer,
       cmd_buffer->state.descriptors_dirty |=
          set_layout->shader_stages & VK_SHADER_STAGE_ALL_GRAPHICS;
    }
-
-   /* Pipeline layout objects are required to live at least while any command
-    * buffers that use them are in recording state. We need to grab a reference
-    * to the pipeline layout being bound here so we can compute correct dynamic
-    * offsets for VK_DESCRIPTOR_TYPE_*_DYNAMIC in dynamic_offset_for_binding()
-    * when we record draw commands that come after this.
-    */
-   pipe_state->layout = layout;
 }
 
 void anv_CmdBindDescriptorSets(