nir: preserve all metadata when nir_lower_int_to_float doesn't make progress

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13189>

src/compiler/nir/nir_lower_int_to_float.c

@@ -165,6 +165,8 @@ nir_lower_int_to_float_impl(nir_function_impl *impl)
    if (progress) {
       nir_metadata_preserve(impl, nir_metadata_block_index |
                                   nir_metadata_dominance);
+   } else {
+      nir_metadata_preserve(impl, nir_metadata_all);
    }
 
    free(float_types);