RFR: JDK-8222930: ConcurrentSkipListMapTest.clone() broken since jdk10

[Adam Farley8]

Hi All,

ConcurrentSkipListMapTest.clone() produces a clone that shares the array 
size variable of the original, and then doubles it.

So both arrays, original and clone, tell the user that each is twice as 
big as it actually is.

The proposed fix is to simply set the clone's array size variable to null 
during creation.

Fix and test code available.

Reviews and sponsor requested.

Webrev: http://cr.openjdk.java.net/~afarley/8222930.0/jdk13/webrev/

Bug: https://bugs.openjdk.java.net/browse/JDK-8222930

Best Regards

Adam Farley 
IBM Runtimes

P.S. Apparently this has been broken since JDK 10, so we should look at 
backporting (at least to 11 and 12) once this is in.

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