}

// Returns the data type of the destination of an edge.
DataType EdgeType(const Edge* edge) {
  return edge->dst()->input_type(edge->dst_input());
}

// Adds the control inputs of `node` to `*deps`.
void AddControlInputs(const Node& node, absl::flat_hash_set<Node*>* deps) {
  for (const Edge* edge : node.in_edges()) {
    if (edge->IsControlEdge()) {
      deps->insert(edge->src());
    }
  }
}