[llvm] [VPlan] Omit zero add in VPWidenIntOrFpInductionRecipe (PR #119668)

[Mel Chen via llvm-commits]

https://github.com/Mel-Chen commented:

Look good if `getStepVector` only have one user `VPWidenIntOrFpInductionRecipe::execute`.

https://github.com/llvm/llvm-project/pull/119668