[8u40] approval request for 8056123: Anonymous function statements leak internal function names into global scope

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8056123
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-August/003351.html
jdk8u40 webrev: http://cr.openjdk.java.net/~sundar/8056123/8u40/

jdk8u40 changeset is same as that of jdk9 except for modular source 
directory layout difference.

Thanks
-Sundar