Use FileName in TextMark

Change-Id: I3666d95dc8ef3b7da099d6d30f5cb4678a349493
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangcodemodel/clangtextmark.h

@@ -39,7 +39,7 @@ class ClangTextMark : public TextEditor::TextMark
 public:
     using RemovedFromEditorHandler = std::function<void(ClangTextMark *)>;
 
-    ClangTextMark(const QString &fileName,
+    ClangTextMark(const ::Utils::FileName &fileName,
                   const ClangBackEnd::DiagnosticContainer &diagnostic,
                   const RemovedFromEditorHandler &removedHandler,
                   bool showLineAnnotations);