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

[Krystian Stasiowski via cfe-commits]

sdkrystian 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.

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