[clang] [lldb] [Clang] Improve Sema diagnostic performance for __builtin_counted_by_ref (PR #116719)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

For the record, Aaron is not on vacation. So if you need his sign-off, you should wait.

https://github.com/llvm/llvm-project/pull/116719