// removed afterwards.`
void OutlineCluster(tf_device::ClusterOp cluster_op, SymbolTable* symbol_table,
                    OpBuilder* builder) {
  llvm::SetVector<Value> live_ins;
  getUsedValuesDefinedAbove(cluster_op.getBody(), cluster_op.getBody(),
                            live_ins);

  func::FuncOp outlined_func =
      BuildFunction(live_ins.getArrayRef(), cluster_op, symbol_table, builder);

  for (IslandOp island_op : islands_to_outline) {
    // Build the function signature.

    // First the captured values in the island are function arguments
    llvm::SetVector<Value> operands;
    getUsedValuesDefinedAbove(island_op.getBody(), operands);

    SmallVector<Type, 16> func_operand_types;
    func_operand_types.reserve(operands.size());
    for (Value operand : operands)