[8u20] Request for approval for JDK-8040078

[Hannes Wallnoefer]

Please approve the backports of this Nashorn fix to jdk8u-dev.

Bug: https://bugs.openjdk.java.net/browse/JDK-8040078
Webrev: http://cr.openjdk.java.net/~hannesw/8040078/
JDK9 changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/e88f1df9b412

The patch applies cleanly to jdk8u-dev.

Thanks,
Hannes