[VPlan] Handle VPWidenCastRecipe without underlying value in EVL transform (#120194) This fixes a crash that shows up when building SPEC CPU 2017 with EVL tail folding on RISC-V. A VPWidenCastRecipe doesn't always have an underlying value, and in the case of this crash this happens whenever a widened cast is created via truncateToMinimalBitwidths. Fix this by just using the opcode stored in the recipe itself. I think a similar issue exists with VPWidenIntrinsicRecipe and how it's widened, but I haven't run into any crashes with it just yet.
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