[clang] [Clang] Fix name lookup for dependent bases (PR #114978)

[Matheus Izvekov via cfe-commits]

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

LGTM, but give some time for @sdkrystian to take a look, since he is actively working on this area.

https://github.com/llvm/llvm-project/pull/114978