[llvm] [VPlan] Remove no longer needed VP intrinsic handling in VPWidenIntrinsicRecipe::computeCost. NFCI (PR #137573)

[Florian Hahn via llvm-commits]

https://github.com/fhahn approved this pull request.

LGTM, thanks for removing this.

https://github.com/llvm/llvm-project/pull/137573