[clang] [Clang] [Sema] Handle placeholders in '.*' expressions (PR #83103)

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Sirraide wrote:

> LGTM!

Thanks. Just so you know, I still don’t have commit access, so you’d have to merge it for me—I should really look into obtaining commit access at this point perhaps

https://github.com/llvm/llvm-project/pull/83103