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

[Erich Keane via cfe-commits]

erichkeane wrote:

> @Endilll `clang/www/make_cxx_dr_status` queries core issues from https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_index.html. Since a new revision of the index has not yet been published since CWG2858 was opened, `clang/www/make_cxx_dr_status` doesn't add an entry for the issue.

Yeah, those don't get published consistently.  You have to pick them up from the latest committee wiki (see the 'attachments' list here: https://wiki.edg.com/bin/view/Wg21tokyo2024/CoreWorkingGroup).

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