microsoft/compiler: preserve all metadata when upcast_phi doesn't make progress

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12324>

src/microsoft/compiler/dxil_nir.c

@@ -1116,6 +1116,8 @@ upcast_phi_impl(nir_function_impl *impl, unsigned min_bit_size)
    if (progress) {
       nir_metadata_preserve(impl, nir_metadata_block_index |
                                   nir_metadata_dominance);
+   } else {
+      nir_metadata_preserve(impl, nir_metadata_all);
    }
 
    return progress;