std::vector<bool> const_args(arg_types.size());
  // If we can't analyze the const args. Bail out.
  TF_RETURN_IF_ERROR(
      BackwardsConstAnalysis(*((*fbody)->graph), &const_args,
                             /*compile_time_const_nodes=*/nullptr, flr));

  for (size_t i = 0; i < const_args.size(); ++i) {
    if (const_args[i]) {
      constant_arg_indices->push_back(i);
    }
  }