nir: Rename nir_intrinsic_barrier to control_barrier

This is a more explicit name now that we don't want it to be doing any
memory barrier stuff for us.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3307>

src/compiler/nir/nir_schedule.c

@@ -347,7 +347,7 @@ nir_schedule_intrinsic_deps(nir_deps_state *state,
       add_write_dep(state, &state->store_shared, n);
       break;
 
-   case nir_intrinsic_barrier:
+   case nir_intrinsic_control_barrier:
    case nir_intrinsic_memory_barrier_shared:
       add_write_dep(state, &state->store_shared, n);