GC default mode for the stand-alone interpreter is generational mode

lua.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lua.c,v 1.231 2017/04/19 12:49:17 roberto Exp roberto $
+** $Id: lua.c,v 1.232 2017/05/24 21:11:19 roberto Exp roberto $
 ** Lua stand-alone interpreter
 ** See Copyright Notice in lua.h
 */
@@ -571,6 +571,7 @@ static int pmain (lua_State *L) {
   }
   luaL_openlibs(L);  /* open standard libraries */
   createargtable(L, argv, argc, script);  /* create table 'arg' */
+  lua_gc(L, LUA_GCGEN, 0, 0);  /* GC in generational mode */
   if (!(args & has_E)) {  /* no option '-E'? */
     if (handle_luainit(L) != LUA_OK)  /* run LUA_INIT */
       return 0;  /* error running LUA_INIT */