8001666: Add updateAndGet, getAndUpdate, getAndAccumulate, accumulateAndGet methods to AtomicXXX

[Chris Hegarty]

This proposal is to add lambda-compatible atomics and accumulators to 
the ActomicXXX classes.

Webrev:
   http://cr.openjdk.java.net/~chegar/8001666/ver.00/webrev/
SpecDiff:
 
http://cr.openjdk.java.net/~chegar/8001666/ver.00/specdiff/java/util/concurrent/atomic/package-summary.html

This changes come from Doug, with the exception of the AtomicXXXArray 
classes.

Doug,
   You have not added the equivalent atomics and accumulators the Array 
classes. Was this intentional? I no reason why this shouldn't be done, 
so went ahead and did it.

-Chris.