[VPlan] Compute cost for most opcodes in VPWidenRecipe (NFCI). (#98764) Implement VPWidenRecipe::computeCost for most cases (except UDiv,SDiv,URem,SRem which require additional logic). Note that this specializes `::computeCost` instead of `::cost`, as `VPRecipeBase::cost` is responsible for skipping cost-computations for pre-computed recipes for now. The most recent version of the VPlan-based cost model introduction has been committed on Jul 10 (b841e2eca3b5c8b) and we should probably give it at least a week in case additional mismatches surface. PR: https://github.com/llvm/llvm-project/pull/98764
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