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

[via cfe-commits]

cor3ntin wrote:

I think there won't be a rc4 so it's actually probably too late (@tobias) - but presumably there will be a `19.0.2` version a couple of weeks after release. So ~2 or 3 weeks?

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