[llvm] [VPlan] Simplify vp.merge true, (or x, y), x -> vp.merge y, true, x (PR #135017)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

I think we could also have non-widened intrinsic calls in VPReplicateRecipe. I guess also matching those and having a generic m_Intrinsic would add a substantial amount of extra logic?

https://github.com/llvm/llvm-project/pull/135017