[clang] [clang] [C++20] Defaulted operator== doesn't lookup in using-directive properly #97087 (PR #99542)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll commented:

Thank you for working on this!
You should add one or more tests under `clang/test/SemaCXX`.
You should also add an entry to `clang/doc/ReleaseNotes.rst`.

https://github.com/llvm/llvm-project/pull/99542