}
  }
  return absl::OkStatus();
}

// Step 1 for `PostprocessEdgesBetweenOutsideCompilations`. See comments of
// `PostprocessEdgesBetweenOutsideCompilations` for details.
Status PostprocessDataEdgesBetweenOutsideCompilations(
    Graph* g, const string& outside_compilation_attr_name) {
  // Gather all outside compilation to outside compilation nodes.
  std::vector<Node*> placeholder_nodes;
  for (Node* n : g->nodes()) {