New macros for arithmetic/bitwise operations in 'luaV_execute'

The repetitive code of the arithmetic and bitwise operators in
the main iterpreter loop was moved to appropriate macros.
(As a detail, the function 'luaV_div' was renamed 'luaV_idiv',
as it does an "integer division" (floor division).

ltm.h

@@ -77,7 +77,7 @@ LUAI_FUNC void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
                               StkId res, TMS event);
 LUAI_FUNC void luaT_trybinassocTM (lua_State *L, const TValue *p1,
        const TValue *p2, StkId res, int inv, TMS event);
-LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, int i2,
+LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2,
                                int inv, StkId res, TMS event);
 LUAI_FUNC int luaT_callorderTM (lua_State *L, const TValue *p1,
                                 const TValue *p2, TMS event);