explicit NameUniquifier(const FunctionLibraryDefinition& flib)
      : flib_(flib) {}

 private:
  bool IsUnique(llvm::StringRef name) override {
    return !flib_.Contains(std::string(name));
  }

  std::string GetName(OpOrVal op_or_val) override {
    DCHECK(false) << "Unimplemented";
    return "";
  }

  const FunctionLibraryDefinition& flib_;
};