AddValueUniqueIDMapping(value, next_unique_instance_id++);
    }
  };

  // Helper to assign new unknown id for all resources in the given list of
  // values.
  auto assign_unknown_id_to_all = [&](ValueRange values) {
    for (Value value : filter_resources(values)) {
      AddValueUniqueIDMapping(value, kUnknownResourceId);
    }
  };