[8u40] Request for approval: JDK-8059938: NPE restoring cached script with optimistic types disabled

[Hannes Wallnoefer]

Please approve backport of JDK-8059938 to 8u40.

Bug: https://bugs.openjdk.java.net/browse/JDK-8059938
Webrev: http://cr.openjdk.java.net/~hannesw/8059938/
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-October/003608.html
Changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/7819ff15e698

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

Thanks,
Hannes