Clang: Print message if message is lost

If there is a message counter mismatch it is very helpful to get message
content.

Change-Id: I4ea2526bd4b72010627e99de08ff9a8e64ca3d02
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/libs/clangbackendipc/readmessageblock.h

@@ -48,7 +48,7 @@ public:
 
 private:
     bool isTheWholeMessageReadable(QDataStream &in);
-    void checkIfMessageIsLost(QDataStream &in);
+    bool checkIfMessageIsLost(QDataStream &in);
 
 private:
     QIODevice *ioDevice;