[clang] [clang-tools-extra] [clang] Implement CWG2398 provisional TTP matching to class templates (PR #92855)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

Thanks for the heads up, this does look like a problem. I am reverting it for now.

https://github.com/llvm/llvm-project/pull/92855