Debugger: Slim down CHECK_STATE() expansion

Less generated code.

Change-Id: Iafcafc875afa3ead12e10fd5f316d9663b2f9823
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

src/plugins/debugger/debuggerengine.h

@@ -442,6 +442,7 @@ protected:
         DebuggerState state);
 
     void updateLocalsView(const GdbMi &all);
+    void checkState(DebuggerState state, const char *file, int line);
 
 private:
     // Wrapper engine needs access to state of its subengines.