QmlProfiler: Use QList for QmlRange container when loading .qtd

As we are using this as a queue, with many calls to takeFirst(), a
QVector is prohibitively expensive here.

Change-Id: I151452ae1299ab520a3aceae7ff3da0e29fe9bf9
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmlprofiler/qmlprofilertracefile.cpp

@@ -430,7 +430,7 @@ private:
         QmlEvent end;
     };
 
-    QVector<QmlRange> ranges;
+    QList<QmlRange> ranges; // We are going to do a lot of takeFirst() on this.
 };
 
 void EventList::addEvent(const QmlEvent &event)