vararg back to '...' (but with another implementation)

new implementation should have zero overhead for non-vararg functions

ldo.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.h,v 2.39 2018/01/10 19:19:27 roberto Exp roberto $
+** $Id: ldo.h,v 2.40 2018/02/06 19:16:56 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -42,6 +42,11 @@
     p = restorestack(L, t__))  /* 'pos' part: restore 'p' */
 
 
+/* macro to check stack size and GC */
+#define checkstackGC(L,fsize)  \
+	luaD_checkstackaux(L, (fsize), (void)0, luaC_checkGC(L))
+
+
 /* type of protected functions, to be ran by 'runprotected' */
 typedef void (*Pfunc) (lua_State *L, void *ud);
 
@@ -57,7 +62,10 @@ LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
                                         ptrdiff_t oldtop, ptrdiff_t ef);
 LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, StkId firstResult,
                                           int nres);
+LUAI_FUNC void luaD_rethook (lua_State *L, CallInfo *ci);
 LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);
+LUAI_FUNC void luaD_moveresults (lua_State *L, StkId firstResult, StkId res,
+                                               int nres, int wanted);
 LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);
 LUAI_FUNC void luaD_shrinkstack (lua_State *L);
 LUAI_FUNC void luaD_inctop (lua_State *L);