[VPlan] Add new VPScalarCastRecipe, use for IV & step trunc.#78113
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[VPlan] Add new VPScalarCastRecipe, use for IV & step trunc.#78113
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Add a new recipe to model scalar cast instructions, without relying on an underlying instruction.
This allows creating scalar casts, without relying on an underlying instruction (like the current
VPReplicateRecipe). The new recipe is used to explicitly model both truncating the induction step
and the VPDerivedIVRecipe, thus simplifying both the recipe and code needed to introduce it.
Truncating VPWidenIntOrFpInductionRecipes should also be modeled using the new recipe, as
follow-up.