// within the subgraph and are referenced outside the subgraph.
  llvm::SmallVector<Type> input_types =
      TypesFromValues(subgraph.FuncArguments());
  llvm::SmallVector<Type> return_types =
      TypesFromValues(subgraph.FuncOutputs());

  FunctionType function_type =
      builder.getFunctionType(input_types, return_types);