Retroactive push request for JDK-8025435 - optimistic builtins

[Marcus Lagergren]

As requested by Seán to keep the history straight and make sure there are no gaps in the backport record. This was a few days late for FC; but has been approved by all stakeholders in the release team.

The CR: https://bugs.openjdk.java.net/browse/JDK-8025435
The discussion thread: http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-September/003496.html
The webrev: http://cr.openjdk.java.net/~lagergren/8025435.3/webrev/

Regards
Marcus