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

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

It was a pure accident I opened this PR. I think draft status does a good job at silencing notifications.
I spend a decent amount of time in P1787R6, so I might be able to provide good feedback. I'll take a look tomorrow.
It would be nice to see a test for CWG1835 among the changes, even if you're not sure about your interpretation.

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