Autolayout: Add constraint to superview and not Top Layout Guide?

There is an arrow to the right of the constraint constant value. If you click on it, a menu pops out where you can choose what is it that you want to make your constraint relative to. If you choose 'View', than it will pin it to the top of the view.

You should be able to do it by highlighting the view you want in the storyboard and then selecting Editor > Pin > Top Space to Superview in the top menu.

---

This is outdated in XCode 7, see @PaulGurov's answer instead.