Given that there is active work on improving optimized debug info, more such tests will definitely appear. The current discussion is directly about how to keep it from becoming worse.
I know there are lots of kinds of debug-info metadata, and more are being proposed, for example in [RFC] Heterogeneous Debug Info. I don’t work with IR much so I don’t have specifics. I only know enough to be worried about it. 
And that the idea of applying the scripts to debug-info tests is completely new, therefore the behavior of the scripts in that context is uncertain and needs to be validated before we start relying on it too much.