faster Set loading time from .rdb file resizing the hash table to the right...

faster Set loading time from .rdb file resizing the hash table to the right size before loading elements

redis.c

@@ -3335,6 +3335,10 @@ static robj *rdbLoadObject(int type, FILE *fp) {
 
         if ((listlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
         o = (type == REDIS_LIST) ? createListObject() : createSetObject();
+        /* It's faster to expand the dict to the right size asap in order
+         * to avoid rehashing */
+        if (type == REDIS_SET && listlen > DICT_HT_INITIAL_SIZE)
+            dictExpand(o->ptr,listlen);
         /* Load every single element of the list/set */
         while(listlen--) {
             robj *ele;