private boolean keyEq(Object src, Object dest) {
            return identityComparisons ? src == dest : src.equals(dest);
        }
The collected weak-key reference queue for this segment.
This should be (re)initialized whenever table is assigned,
commons-profiler/src/main/java/com/navercorp/pinpoint/common/profiler/concurrent/jsr166/ConcurrentReferenceHashMap.java