cxxrtl: use debug attrs of alias not aliasee

backends/cxxrtl/cxxrtl_backend.cc

@@ -2497,7 +2497,7 @@ struct CxxrtlWorker {
 							// Alias of a member wire
 							const RTLIL::Wire *aliasee = debug_wire_type.sig_subst.as_wire();
 							f << indent << "items->add(path, " << escape_cxx_string(get_hdl_name(wire)) << ", ";
-							dump_debug_attrs(aliasee);
+							dump_debug_attrs(wire);
 							f << ", ";
 							// If the aliasee is an outline, then the alias must be an outline, too; otherwise downstream
 							// tooling has no way to find out about the outline.