[wasm] Add WASILibc module and its build support #66539

kateinoigakukun merged 2 commits intoswiftlang:mainswiftlang/swift:mainfrom

kateinoigakukun:katei/patch-series/wasi-libc-modulekateinoigakukun/swift:katei/patch-series/wasi-libc-moduleCopy head branch name to clipboard