[clang] [Clang][Sema] Fix bug where operator-> typo corrects in the current instantiation (PR #91972)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

I think this needs a release note?  I know the only case we have right now is because of your other patch, but perhaps this affects elsewhere too?

https://github.com/llvm/llvm-project/pull/91972