compiler: add new MESH_VIEW_COUNT/MESH_VIEW_INDICES system values

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Acked-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14263>

src/compiler/shader_enums.h

@@ -800,6 +800,14 @@ typedef enum
    SYSTEM_VALUE_RAY_INSTANCE_CUSTOM_INDEX,
    /*@}*/
 
+   /**
+    * \name Task/Mesh shader system values
+    */
+   /*@{*/
+   SYSTEM_VALUE_MESH_VIEW_COUNT,
+   SYSTEM_VALUE_MESH_VIEW_INDICES,
+   /*@}*/
+
    /**
     * IR3 specific geometry shader and tesselation control shader system
     * values that packs invocation id, thread id and vertex id.  Having this