[8u40] Request for approval: JDK-8057021: UserAccessorProperty guards fail with multiple globals

[Hannes Wallnoefer]

Please approve backport of JDK-8057021 to 8u40.

Bug: https://bugs.openjdk.java.net/browse/JDK-8057021
Webrev: http://cr.openjdk.java.net/~hannesw/8057021/
Changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/8a4af0397070
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-September/003429.html

The patch applies cleanly after fixing path names.

Thanks,
Hannes