[llvm] [RemoveDIs] Update update_test_checks script to recognize dbg_records (PR #87388)

[Nicolai Hähnle via llvm-commits]

https://github.com/nhaehnle commented:

I think this is mostly okay, but see the remark inline. It is a bit unfortunate that you'll have META prefixes on the FileCheck variable names instead of DBG prefixes, but I see no easy and robust way to improve on that.

https://github.com/llvm/llvm-project/pull/87388