[clang] [clang-tools-extra] [clang] Implement CWG2398 provisional TTP matching to class templates (PR #94981)

[Alexander Kornienko via cfe-commits]

alexfh wrote:

Thanks! The fix resolves the crash, but the original code still doesn't compile. See https://github.com/llvm/llvm-project/pull/108491#issuecomment-2350634130

https://github.com/llvm/llvm-project/pull/94981