[8u] Approval request for 8080501: javaarrayconversion.js test is flawed

[Sundararajan Athijegannathan]

Please approve.

Bug:https://bugs.openjdk.java.net/browse/JDK-8080501
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-September/005248.html
jdk8u webrev: http://cr.openjdk.java.net/~sundar/8080501/8u/webrev.00/

Backported 'as is' except for the modular source layout difference.

Thanks,
-Sundar