[clang] [clang] Add tests for some CWG issues from 2024-05-31 telecon (PR #94167)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

LGTM, curious why you skipped some and not others from that telecom. Likely folks won't be able to check out the DRs until after St Louis. 

https://github.com/llvm/llvm-project/pull/94167