small changes in field order in some structs to reduce padding

lstate.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.101 2014/02/18 13:39:37 roberto Exp roberto $
+** $Id: lstate.h,v 2.102 2014/02/18 13:46:26 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -69,9 +69,9 @@ typedef struct CallInfo {
       const Instruction *savedpc;
     } l;
     struct {  /* only for C functions */
-      int ctx;  /* context info. in case of yields */
       lua_CFunction k;  /* continuation in case of yields */
       ptrdiff_t old_errfunc;
+      int ctx;  /* context info. in case of yields */
       lu_byte old_allowhook;
       lu_byte status;
     } c;