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

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

> Can you please add more details in your summary about the problem and how the PR will fix the problem.
@shafik I will once I get back to this PR.

> @sdkrystian do you plan to add more tests?
@cor3ntin I do, I just haven't gotten around to it yet :)

https://github.com/llvm/llvm-project/pull/104458