[llvm] BasicAA: return more PartialAlias when scalable (PR #110519)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> I think this isn't wrong, but it's also not useful for anything. We will not be able to use a PartialAlias result without proper nesting and an offset.

I see. Do you think it's possible to come up with an offset in a scalable context? I was initially trying that, similar to the non-scalable case, but was worried about correctness issues and abandoned that change.

https://github.com/llvm/llvm-project/pull/110519