4d7d6f276c
This patch calls `lua_close()` on Lua dtor. This guarantees that the Lua GC finalizers are honored, aside from the usual internal clean up. It also guarantees a call to the `__close` metamethod of any active to-be-closed variable in Lua 5.4. Since the previous `luaL_openlibs()` was a noop, because the standard library is cached internally, I've removed it. Differential Revision: https://reviews.llvm.org/D90557