[clang] [libcxx] [Clang] Implement resolution for CWG1835 (PR #92957)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

Sorry this took so long!  Apparently I'd left some comments without finishing my review.  Did another look through, everything looks good, just some minor nits.  Apply/merge at your convenience.

https://github.com/llvm/llvm-project/pull/92957