qmljs: correctly handle js string templates

In most cases we do want to visit the expressions in a function
template. Changing its accept0 would force those not wanting to visit
it to iterate on the templates (currently a linked list), so we add a
visit method explicitly visiting the expression in all the needed
places.

Fixes: QTCREATORBUG-21869
Change-Id: I47733544bfd32eec357810b97242608b8f7de572
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/libs/qmljs/qmljscheck.cpp

@@ -809,6 +809,12 @@ bool Check::visit(UiObjectInitializer *)
     return true;
 }
 
+bool Check::visit(AST::TemplateLiteral *ast)
+{
+    Node::accept(ast->expression, this);
+    return true;
+}
+
 void Check::endVisit(UiObjectInitializer *uiObjectInitializer)
 {
     Q_UNUSED(uiObjectInitializer)