[8u20] Request approval to backport 8041697: CompiledScript slower when eval with binding

[A. Sundararajan]

Please approve backport for 8041697:  CompiledScript slower when eval 
with binding

Backport from jdk9-dev "as is" without any jdk8u specific changes.

Bug: https://bugs.openjdk.java.net/browse/JDK-8041697
Webrev: http://cr.openjdk.java.net/~sundar/8041697/
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-May/002952.html
jdk9 changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/7217348b5f95

Thanks,
-Sundar