nir/use_dominance: invalidate nir_metadata_instr_index

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33354>

src/compiler/nir/nir_use_dominance.c

@@ -288,6 +288,8 @@ nir_calc_use_dominance_impl(nir_function_impl *impl, bool post_dominance)
       }
    }
 
+   nir_metadata_preserve(impl, nir_metadata_all & ~nir_metadata_instr_index);
+
    return state;
 }