You wouldn't happen to know a similar unit test that I could base it on?

I know this change is old but I'd like to get it committed if possible. (Got waylaid by the pandemic) Or maybe abandon it and resubmit?
Anyway, are there any reviewers out there?

Added a new test

I'm new to this, my first contribution, so bear with me.

Added extra Verifier checks to ensure the base type of a set is either an Enumeration or a Base type with integer encoding.
I will extend this check when I land a patch to extend subranges since a set can have a subrange as a basetype.
The llvm-dwarfdump tool outputs set debugging information without any enhancements.
I do not have commit access, so I wonder if someone could commit these changes if acceptable?

Could someone please commit this patch if acceptable.