RFR 8014076: Arrays parallel and serial sorting improvements

[Chris Hegarty]

Doug has made some updates to the java.util.Arrays sorting code to 
provide stable sorting. There have also been some changes to the 
original Parallel Array Sorting ( MIN_ARRAY_SORT_GRAN is public again ).

Right now a copy of this work is sitting in the lambda repo. This issue 
proposed to integrate this work into jdk8.

http://cr.openjdk.java.net/~chegar/8014076/ver.00/specdiff/java/util/Arrays.html
http://cr.openjdk.java.net/~chegar/8014076/ver.00/webrev/

Thanks,
-Chris.