CppEditor: Fix operator refactoring

The refactoring option was not triggered if the operator definition had
a different amount of whitespace after "operator" than the declaration.

Fixes: QTCREATORBUG-6236
Change-Id: Idf6438203e28d3f1effe0a0375d6563f813a9726
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cppeditor/cppfunctiondecldeflink.h

@@ -104,6 +104,8 @@ public:
     CPlusPlus::FunctionDeclaratorAST *targetFunctionDeclarator = nullptr;
 
 private:
+    QString normalizedInitialName() const;
+
     bool hasMarker = false;
 
     friend class FunctionDeclDefLinkFinder;