[VPlan] Handle VPWidenCastRecipe without underlying value in EVL transform#120194

lukel97 merged 6 commits intollvm:mainllvm/llvm-project:mainfrom

lukel97:loop-vectorize/evl-transform-VPWidenCastRecipe-no-underlying-valuelukel97/llvm-project:loop-vectorize/evl-transform-VPWidenCastRecipe-no-underlying-valueCopy head branch name to clipboard