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

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@erichkeane I pushed a commit ([10ba129](https://github.com/llvm/llvm-project/pull/109422/commits/10ba1292798f16bc71fe8466a0ec84f146efb6f5)) which eliminates the out parameter in favor of building a `CXXOperatorCallExpr` with type `ASTContext::DependentTy`. WDYT?

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