nir/lower_explicit_io: fix metadata preserve

This pass can insert if blocks, therefore no dominance/block_index for
you.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Reviewed-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19818>

src/compiler/nir/nir_lower_io.c

@@ -2310,8 +2310,7 @@ nir_lower_explicit_io_impl(nir_function_impl *impl, nir_variable_mode modes,
    }
 
    if (progress) {
-      nir_metadata_preserve(impl, nir_metadata_block_index |
-                                  nir_metadata_dominance);
+      nir_metadata_preserve(impl, nir_metadata_none);
    } else {
       nir_metadata_preserve(impl, nir_metadata_all);
    }