Clang: Change name to registerCurrentCppDocuments

registerCurrentUnsavedFiles was misleading.

Change-Id: I5a2444d81d141ced4b8a0fae7236484c9e919d8d
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/clangcodemodel/clangbackendipcintegration.h

@@ -152,7 +152,7 @@ private:
     void initializeBackendWithCurrentData();
     void registerEmptyProjectForProjectLessFiles();
     void registerCurrentProjectParts();
-    void registerCurrentUnsavedFiles();
+    void registerCurrentCppEditorDocuments();
     void registerCurrrentCodeModelUiHeaders();
 
     void onBackendRestarted();