[8u60] approval request for 8079145: jdk.nashorn.internal.runtime.arrays.IntArrayData.convert assertion

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8079145
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-May/004585.html
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8079145/8u60/webrev.00/

Thanks,
-Sundar