[LoongArch] Use div.w/mod.w to eliminate unnecessary sign-extend for sdiv/srem i32.#117298

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

tangaac:feature/divw-not-signed-extendtangaac/llvm-project:feature/divw-not-signed-extendCopy head branch name to clipboard