public long addAndGet(long delta) {
        return getAndAddVal( delta) + delta;
    }
Atomically adds to current value te given value.

@param delta the value to add
@return the updated value
@see java.util.concurrent.atomic.AtomicLong#addAndGet(long)
jctools-core/src/main/java/org/jctools/util/PaddedAtomicLong.java