[llvm-branch-commits] [clang] Cherry pick: [Clang][Sema] Make UnresolvedLookupExprs in class scope explicit spec… (PR #102514)

[Krystian Stasiowski via llvm-branch-commits]

https://github.com/sdkrystian approved this pull request.

I think backporting this change is reasonable. WDYT @AaronBallman?

https://github.com/llvm/llvm-project/pull/102514