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?