message: Replace std::string with StringRef
diff: @@ -922,7 +922,7 @@ static SDKTypeMinVersion GetSDKType(const llvm::Triple &target,
  }
  }
  -static std::string GetXcodeContentsPath() {
  +static StringRef GetXcodeContentsPath() {
  static std::once_flag g_once_flag;
  static std::string g_xcode_contents_path;
  std::call_once(g_once_flag, [&]() {
  