barrier for prototype's cache (with new gray list 'protogray' to keep

prototypes to have their caches visited again) + constant 'MAXMISS'

lfunc.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lfunc.h,v 2.15 2015/01/13 15:49:11 roberto Exp roberto $
+** $Id: lfunc.h,v 2.16 2017/04/11 18:41:09 roberto Exp roberto $
 ** Auxiliary functions to manipulate prototypes and closures
 ** See Copyright Notice in lua.h
 */
@@ -32,6 +32,13 @@
 #define upisopen(up)	((up)->v != &(up)->u.value)
 
 
+/*
+** maximum number of misses before giving up the cache of closures
+** in prototypes
+*/
+#define MAXMISS		10
+
+
 LUAI_FUNC Proto *luaF_newproto (lua_State *L);
 LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nelems);
 LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nelems);