[DAGCombiner] Attempt to fold 'add' nodes to funnel-shift or rotate#125612

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

AlexMaclean:dev/amaclean/upstream-rotate-add-sdagAlexMaclean/llvm-project:dev/amaclean/upstream-rotate-add-sdagCopy head branch name to clipboard