[8u40] Request for approval: JDK-8062583: Throwing object with error prototype causes error proto to be caught

[Hannes Wallnoefer]

Please approve backport of JDK-8062583 to 8u40.

The patch applies cleanly to 8u40 after fixing path names.

Bug: https://bugs.openjdk.java.net/browse/JDK-8062583
Webrev: http://cr.openjdk.java.net/~hannesw/8062583/webrev.01/
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-October/003775.html
Changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/77e8e0efd4d8

Thanks,
Hannes