[VPlan] Omit zero add in VPWidenIntOrFpInductionRecipe (#119668) I'm not sure if getStepVector was used for other things in the past where StartIdx was non-zero, but nowadays VPWidenIntOrFpInductionRecipe is the only user of it, and just passes zero to it. I presume InstCombine was already catching this so hopefully removing this won't affect codegen.
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