[InstCombine] Don't cover up poison elements for shifts when folding shuffles thru binops#141303

lukel97 merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

lukel97:instcombine/foldVectorBinop-remove-shift-safe-vec-constantlukel97/llvm-project:instcombine/foldVectorBinop-remove-shift-safe-vec-constantCopy head branch name to clipboard