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

[Nicolai Hähnle via llvm-commits]

nhaehnle wrote:

Not directly, although it would arguably be a stepping stone in that direction.

The major difficulty is that we emit check lines gradually before processing everything. So we emit check lines while processing a function, which commits us to using e.g. `META13`. We can't change our minds about it later when we see the global definition at the end of the file.

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