Is the "-view-regions-only" pass still available in clang13?

I have tried clang 13 on several platforms (linux and macOS) but I get the following error in every case:

opt: unknown pass name 'view-regions-only'

I have tried both the traditional opt -view-regions-only and the newer opt -passes=view-regions-only techniques to no avail.

This has been a very useful part of my workflow for quite a while. Does anyone know the current state or how I might get a similar visual region graph via some other technique?

Thanks!