[clang] Revert "[Clang][Sema] Fix lookup of dependent operator= outside of complete-class contexts (#91498)" (PR #91620)

[Erich Keane via cfe-commits]

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

This reverts the problematic parts of the previous patch too, right?  If so, LGTM.

https://github.com/llvm/llvm-project/pull/91620