[clang] [BoundsSafety][Sema] Allow counted_by and counted_by_or_null on pointers where the pointee type is incomplete but potentially completable (PR #106321)

[via cfe-commits]

https://github.com/Sirraide requested changes to this pull request.

I’m pretty sure there are some fundamental problems with the current approach wrt how getting source locations for the attribute is being handled. 

The general approach for the rest of it seems fine from a cursory look, though. :)

https://github.com/llvm/llvm-project/pull/106321