[llvm] [VPlan] Use VPInstructionWithType for uniform casts. (PR #140623)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

> Looks like theres some CI failures: `(GeneratedValue->getType()->isVectorTy() == !GeneratesPerFirstLaneOnly || State.VF.isScalar()) && "scalar value but not only first lane defined"`


Merge with latest main resolved the issue

https://github.com/llvm/llvm-project/pull/140623