[clang] [Clang][Sema] properly remove qualifiers in __is_pointer_interconvertible_base_of (PR #167881)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Thank you for the fix! The changes should come with a release note in `clang/docs/ReleaseNotes.rst` so users know about the fix. But also, do we need to put it under the potentially breaking changes section because now template specializations may silently change behavior because the type trait now returns a different value in some situations? (Do we think the breakage needs some ABI versioning so users can get the old behavior if they were relying on it?)

https://github.com/llvm/llvm-project/pull/167881