HashEntry<K,V> getFirst(int hash) {
            HashEntry<K,V>[] tab = table;
            return tab[hash & (tab.length - 1)];
        }
Returns properly casted first entry of bin for given hash.
commons-profiler/src/main/java/com/navercorp/pinpoint/common/profiler/concurrent/jsr166/ConcurrentReferenceHashMap.java