'clearapihash' -> 'luaS_clearcache' and moved to 'lstring.c' (which

keeps all code related to this cache)

lgc.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.c,v 2.203 2015/03/04 13:31:21 roberto Exp roberto $
+** $Id: lgc.c,v 2.204 2015/03/04 13:51:55 roberto Exp roberto $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
@@ -977,19 +977,6 @@ void luaC_freeallobjects (lua_State *L) {
 }
 
 
-/*
-** Clear API string cache. (Entries cannot be empty, so fill them with
-** a non-collectable string.)
-*/
-static void clearapihash (global_State *g) {
-  int i;
-  for (i = 0; i < STRCACHE_SIZE; i++) {
-    if (iswhite(g->strcache[i]))  /* will entry be collected? */
-      g->strcache[i] = g->memerrmsg;  /* replace it with something fixed */
-  }
-}
-
-
 static l_mem atomic (lua_State *L) {
   global_State *g = G(L);
   l_mem work;
@@ -1030,7 +1017,7 @@ static l_mem atomic (lua_State *L) {
   /* clear values from resurrected weak tables */
   clearvalues(g, g->weak, origweak);
   clearvalues(g, g->allweak, origall);
-  clearapihash(g);
+  luaS_clearcache(g);
   g->currentwhite = cast_byte(otherwhite(g));  /* flip current white */
   work += g->GCmemtrav;  /* complete counting */
   return work;  /* estimate of memory marked by 'atomic' */