[clang] [Bounds Safety][NFC] Add some missing coverage for `-fexperimental-late-parse-attributes` (PR #102236)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman requested changes to this pull request.

Thanks for the additional test coverage! I have some suggestions on how to improve a few of the tests.

https://github.com/llvm/llvm-project/pull/102236