[clang] [clang] Add test for CWG472 (PR #67948)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

None of the implementations seem to agree with the resolution of the DR: https://godbolt.org/z/a7nEvW5Gr

https://github.com/llvm/llvm-project/pull/67948