qmldesigner: compile fix

src/plugins/qmldesigner/core/model/texttomodelmerger.cpp

@@ -45,6 +45,7 @@
 #include <QDeclarativeEngine>
 #include <QSet>
 #include <private/qdeclarativedom_p.h>
+#include <typeinfo>
 
 using namespace QmlJS;
 using namespace QmlJS::AST;