@Override
    protected void inc(long[] cells, long offset, long delta) {
        UNSAFE.getAndAddLong(cells, offset, delta);
    }
Wait-free implementation of striped counter using
Java 8 Unsafe intrinsics (lock addq and lock xchg).

@author Tolstopyatov Vsevolod
jctools-core/src/main/java/org/jctools/counters/FixedSizeStripedLongCounterV8.java