[llvm] [VPlan] Remove VPPredInstPHIRecipe::useScalars (PR #143798)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

oh so this doesn't handle the case from https://github.com/llvm/llvm-project/pull/142594#discussion_r2140339682?

https://github.com/llvm/llvm-project/pull/143798