[8u40] approval request for 8056050: runExternalJsTest method in test/jdk/nashorn/internal/runtime/ClassFilter.java slows down "ant test"

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8056050
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-August/003330.html
jdk8u40 webrev: http://cr.openjdk.java.net/~sundar/8056050/8u40/

jdk9 changeset imported "as is" without any jdk8 specific changes.

Thanks
-Sundar