[clang] [Clang][Sema] Fix crash when MS dependent base class lookup occurs in an incomplete context (PR #83024)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@erichkeane Added a release note. I don't believe there is an open issue (I did a cursory search), found this "in the wild".

https://github.com/llvm/llvm-project/pull/83024