[llvm] [SelectionDAG]: Deduce KnownNeverZero from SMIN and SMAX (PR #85722)

[Jay Foad via llvm-commits]

https://github.com/jayfoad commented:

Code LGTM but I haven't been involved too much in the review so I'll leave it for someone else to approve.

https://github.com/llvm/llvm-project/pull/85722