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

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

Please wait for a week before pinging someone again.

I think this is fine to merge as is, if you want to go ahead. We can always do post commit review later.

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