How to find out the owners of Regions?

[Xazax-hun]

In 59afd42, Region::owner() was removed. We used this to check the context of the declarations. E.g., to check if a Var is a global, we traversed the parents of the enclosing Regions and checked what kind of regions do we encounter. E.g., if we encounter a the Region of a Block, we know this is not a global variable. With Region::owner() removed, we can no longer check what language construct do the parent regions of a Var correspond to.

Is there an alternative way to get this information that I'm missing? Or are we supposed to maintain a mapping independently of IPR on the side?