[InstCombine] Fold `(X * (Y << K)) u>> K -> X * Y` when highbits are not demanded#111151

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

dtcxzyw:perf/demanded-bits-mul-lshrdtcxzyw/llvm-project:perf/demanded-bits-mul-lshrCopy head branch name to clipboard