[llvm] [VPlan] Remove ILV::sinkScalarOperands. (PR #136023)

[via llvm-commits]

https://github.com/ayalz commented:

Very nice milestone! Adding some minor comments.

> There are a few cases that aren't handled by VPlan's sinkScalarOperands,
because the recipes doesn't support replicating. Those are pointer
inductions and blends.

Can some note be left behind documenting this opportunity?

https://github.com/llvm/llvm-project/pull/136023