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

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Sirraide wrote:

> Sorry about that. This PR had become so stale that there merge conflicts and the easiest way to fix it was to squash because the conflicts were with things I later removed.

I see, yeah, it happens; that’s unfortunate...


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