[8u40] approval request for 8050977: Java8 Javascript Nashorn exception: no current Global instance for nashorn

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8050977
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-October/003641.html
jdk8 webrev : http://cr.openjdk.java.net/~sundar/8050977/8u40/webrev.01/

jdk9 changes are backported "as is" except for modular source layout 
difference.

Thanks
-Sundar