[clang] Reapply "[Clang][Sema] Use the correct lookup context when building overloaded 'operator->' in the current instantiation (#104458)" (PR #109422)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

Does this need a release note?  Also, can you point out the 'diff' from the previous commit?

I'm really not a fan of the 'out' parameter, I'd prefer perhaps returning a `std::pair` + structured binding.  WDYT?



https://github.com/llvm/llvm-project/pull/109422