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

[Florian Hahn via llvm-commits]

fhahn wrote:

> > Currently it does not. If/when #163460 land, we can easily merge them as part of #163460 I think
> 
> Could we land #163460 and simplify this patch a bit?

I'd prefer to keep them separate for now, as more work would be needed to make sure the code in this PR can handle all cases supported by the logic in #163460 

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