'Use nameof' codefix doesn't preserve leading trivia if the parameter string is on a new line

![refactorbug1](https://cloud.githubusercontent.com/assets/1058562/11470122/a46f2290-975b-11e5-9ed7-300418f5cf4f.png)
![refactorbug2](https://cloud.githubusercontent.com/assets/1058562/11470123/a477adde-975b-11e5-829e-a423070e5f4b.png)
Found in the [ASP.NET MVC](https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNet.Mvc.Core/Controllers/ControllerActionInvoker.cs#L114) codebase.
