[SCEV] Fold zext(C+A)<nsw> -> (sext(C) + zext(A))<nsw> if possible.#142599

fhahn wants to merge 4 commits intollvm:mainllvm/llvm-project:mainfrom

fhahn:scev-zext-add-nswfhahn/llvm-project:scev-zext-add-nswCopy head branch name to clipboard