[clang] [Clang][Sema] Implement approved resolution for CWG2858 (PR #88042)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll commented:

This looks much better now, thank you! 
As Corentin suggested earlier, run `clang/www/make_cxx_dr_status` to update the DR page, and this should be good to go.

https://github.com/llvm/llvm-project/pull/88042