intel/compiler/mesh: apply URB payload mask once per program

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21098>

src/intel/compiler/brw_fs.h

@@ -412,8 +412,7 @@ public:
                              const fs_reg &urb_handle);
    void emit_task_mesh_load(const brw::fs_builder &bld,
                             nir_intrinsic_instr *instr,
-                            const fs_reg &urb_handle,
-                            bool mask);
+                            const fs_reg &urb_handle);
 
    void emit_barrier();
    void emit_tcs_barrier();