[8011944] Sort fails with ArrayIndexOutOfBoundsException

[Miroslaw Niemiec]

Hello!

This is a simple backport from 8 to 7.
Looking for a review of this even though it only requires a testcase 
change due to the use of lambda expressions.
Since this is the first of these I've encountered I thought I better 
play it safe, but generally speaking, are we ok
to skip the review process for backports like this? (minor lambda 
related testcase changes - if the lambda's are in the actual fix it 
probably makes sense to re-review).

The fix:
src/share/classes/java/util/ComparableTimSort.java
src/share/classes/java/util/TimSort.java

applied with no modification to 7

The only simple change was to replace a lambda expression in test case
test/java/util/Arrays/TimSortStackSize.java:


Arrays.sort(genData(), Integer::compare);

got replaced with

Arrays.sort(genData(),
             new java.util.Comparator<Integer>() {
                public int compare(Integer a1, Integer a2){
                  return Integer.compare(a1.intValue(), a2.intValue());
                }
             });


Jdk bug:
https://bugs.openjdk.java.net/browse/JDK-8011944

Original fix for 8:
http://hg.openjdk.java.net/jdk8/jdk8/jdk/rev/07585a2483fa

Fix for 7:
http://cr.openjdk.java.net/~miroslawzn/801144/webrev.01/


Thank you
Miroslaw