[clang] [Clang] Reject `this void` explicit object parameters (CWG2915) (PR #108817)

[via cfe-commits]

https://github.com/cor3ntin approved this pull request.

LGTM but it would be nice to do the other changes to cxx_dr_status as a separate (NFC) commit

https://github.com/llvm/llvm-project/pull/108817