message: CommandObjectRaw::DoExecute changed signature, fix the "lang swift refcount"
  to match that change.
diff: @@ -4146,7 +4146,7 @@ private:
  }
  protected:
  - bool DoExecute(const char *command, CommandReturnObject &result) {
  + bool DoExecute(llvm::StringRef command, CommandReturnObject &result) {
  StackFrameSP frame_sp(m_exe_ctx.GetFrameSP());
  EvaluateExpressionOptions options;
  options.SetLanguage(lldb::eLanguageTypeSwift);
  