[llvm] [VPlan] Also duplicated scalar-steps when it enables sinking scalars. (PR #136021)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

> LGTM, raises a few thoughts. Changes are consistent with original sink scalar operands?

It is consistent, but in some cases we may have slightly more scalar steps instructions, after duplicating, if there are multiple unrolled parts (one extra step per part for the scalar-steps remaining in the header)


https://github.com/llvm/llvm-project/pull/136021