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

[via cfe-commits]

arrowten wrote:

Hi @erichkeane, I have made the changes in `PushOnScopeChains` accordingly. Please tell me if this works and also if the testcases itself need more changes. Thanks.
@zwuis

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