Support ES6 Set/Map in stringifyWithFunctions#23678

sbc100 merged 8 commits intoemscripten-core:mainemscripten-core/emscripten:mainfrom

fs-eire:jsifier-stringifyWithFunctions-support-set-mapfs-eire/emscripten:jsifier-stringifyWithFunctions-support-set-mapCopy head branch name to clipboard