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

[Shafik Yaghmour via cfe-commits]

shafik wrote:

Can you please add more details in your summary about the problem and how the PR will fix the problem.

Having detailed summaries for got log is important. Also for the code reviewer as well, I should get a good snapshot of the problem and fix from the summary.

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