[clang] [clang] Diagnose use of deprecated template alias (PR #97619)

[via cfe-commits]

premanandrao wrote:

> I just ran the bootstrapping build with this patch applied and ran `check-runtimes`, and nothing failed. This might not be sufficient (perhaps I missed something important), but at first glance it doesn't seem to break anything on our side.

Thank you SO much!  

Would you mind sharing (pointers to) instructions on how you built this?  I was running into errors about __remove_cv_t (and others) at my end.

https://github.com/llvm/llvm-project/pull/97619