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

[Louis Dionne via cfe-commits]

ldionne 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.

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