Fix build breakage caused by use of std::to_string(int). Replace with raw_string_ostream.

      // String "unroll" of "#pragma unroll" is already emitted as the

      // pragma name.

      if (option == UnrollCount)

        OS << getValueString();

        printArgument(OS);

      OS << "\n";

      return;

    }

    assert(SpellingIndex == Pragma_clang_loop && "Unexpected spelling");

    OS << getOptionName(option) << getValueString() << "\n";

    OS << getOptionName(option);

    printArgument(OS);

    OS << "\n";

  }

  // Return a string containing the loop hint argument including the

  // enclosing parentheses.

  std::string getValueString() const {

    std::string ValueName;

  // Prints the loop hint argument including the enclosing parentheses to OS.

  void printArgument(raw_ostream &OS) const {

    OS << "(";

    if (option == VectorizeWidth || option == InterleaveCount ||

        option == UnrollCount)

      ValueName = std::to_string(value);

      OS << value;

    else if (value)

      ValueName = "enable";

      OS << "enable";

    else

      ValueName = "disable";

    return "(" + ValueName + ")";

      OS << "disable";

    OS << ")";

  }

  // Return a string suitable for identifying this attribute in diagnostics.

  std::string getDiagnosticName() const {

    std::string DiagnosticName;

    llvm::raw_string_ostream OS(DiagnosticName);

    unsigned SpellingIndex = getSpellingListIndex();

    if (SpellingIndex == Pragma_unroll && option == Unroll)

      return "#pragma unroll";

      OS << "#pragma unroll";

    else if (SpellingIndex == Pragma_unroll && option == UnrollCount) {

      return "#pragma unroll" + getValueString();

      OS << "#pragma unroll";

      printArgument(OS);

    } else {

      assert(SpellingIndex == Pragma_clang_loop && "Unexpected spelling");

      return std::string(getOptionName(option)) + getValueString();

      OS << getOptionName(option);

      printArgument(OS);

    }

    return OS.str();

  }

  }];