Clang: Do not call DocumentManager::modifiedDocuments() from worker thread

This is unsafe.

Change-Id: I8ac075a7289afa0d84785e37b1325d186a153000
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/clangcodemodel/clangeditordocumentparser.h

@@ -51,7 +51,7 @@ public:
     SemanticMarker::Ptr semanticMarker() const;
 
 private:
-    void updateHelper(CppTools::WorkingCopy workingCopy) override;
+    void updateHelper(const BaseEditorDocumentParser::InMemoryInfo &info) override;
 
     SemanticMarker::Ptr m_marker;
 };