[llvm] [VPlan] Replicate VPScalarIVStepsRecipe by VF outside replicate regions. (PR #170053)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

> This LGTM, thanks! Adding final suggestions. Should VPScalarIVStepsRecipe::execute() be simplified?

I don't think yet, as we may still execute per lane when in replicate regions.

https://github.com/llvm/llvm-project/pull/170053