Fix race condition in tst_QQuickFolderListModel::basicProperties

The FLM updates its contents asynchronously using a thread, so before
we query for the new properties after changing the folder, make sure the
thread finished updating.

Change-Id: Icbd72801f639f9dffdc0dd85fbbd8b3ee53fedda
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Fix stack traces into interpreter code

Make sure to initialize the interpreter instruction pointer pointer
before executing byte code.

Change-Id: I57115699923eeeea627d83536b464f29926d443c
Reviewed-by: Lars Knoll <lars.knoll@digia.com>