[LV] Update incoming blocks in VPWidenPHIRecipe in reassociateBlocks#125481

lukel97 merged 3 commits intollvm:mainllvm/llvm-project:mainfrom

lukel97:loop-vectorize/reassociate-bb-VPWidenPHIRecipelukel97/llvm-project:loop-vectorize/reassociate-bb-VPWidenPHIRecipeCopy head branch name to clipboard