QmlJs: sync qmljs parser

The last version of the grammar contains some constructs that the code model
needs to know.

Task-number: QTCREATORBUG-17842
Change-Id: I6250f96431acc05b19f3fd1b6cc268a07485cf0f
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/qmljs/parser/qmljsengine_p.cpp

@@ -100,7 +100,7 @@ double integerFromString(const char *buf, int size, int radix)
 
 double integerFromString(const QString &str, int radix)
 {
-    QByteArray ba = str.trimmed().toLatin1();
+    QByteArray ba = QStringRef(&str).trimmed().toLatin1();
     return integerFromString(ba.constData(), ba.size(), radix);
 }