[llvm] [LV] Vectorize selecting last IV of min/max element. (PR #141431)

[via llvm-commits]

https://github.com/ayalz approved this pull request.

LGTM, thanks for following up!

May be good to also have end-to-end test(s), to confirm vectorized result is the same as original; and subsequently check relative costs and overall performance benefits.

https://github.com/llvm/llvm-project/pull/141431