Fix a couple places where InsertText was being called with a pointer and size...

Fix a couple places where InsertText was being called with a pointer and size when it really expects a StringRef and a normally optional bool argument.

The pointer was being implicitly converted to a StringRef and the size was being passed into the bool. Since the bool has a default value normally, no one noticed that the wrong number of arguments was given.

llvm-svn: 250977