FFI: Move code for cdata arithmetic to lj_carith.c.

src/lj_carith.h

@@ -0,0 +1,19 @@
+/*
+** C data arithmetic.
+** Copyright (C) 2005-2011 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#ifndef _LJ_CARITH_H
+#define _LJ_CARITH_H
+
+#include "lj_obj.h"
+
+#if LJ_HASFFI
+
+LJ_FUNC int lj_carith_op(lua_State *L, MMS mm);
+
+LJ_FUNC uint64_t lj_carith_powi64(uint64_t x, uint64_t k, int isunsigned);
+
+#endif
+
+#endif