[clang] [Sema] Reject unqualified lookup of local nested class name (PR #192678)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

This still doesn't have a release note, and still hasn't done anything about the tests that don't really cover anything or show the diagnostics of similar things here.  Also, the verify lines are incredibly underspecified.  

This still isn't ready for review.

https://github.com/llvm/llvm-project/pull/192678