【新增】添加原版luajit版本v2.1代码

thirdPart/luajit/src/lj_ff.h

@@ -0,0 +1,18 @@
+/*
+** Fast function IDs.
+** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#ifndef _LJ_FF_H
+#define _LJ_FF_H
+
+/* Fast function ID. */
+typedef enum {
+  FF_LUA_ = FF_LUA,	/* Lua function (must be 0). */
+  FF_C_ = FF_C,		/* Regular C function (must be 1). */
+#define FFDEF(name)	FF_##name,
+#include "lj_ffdef.h"
+  FF__MAX
+} FastFunc;
+
+#endif