RFR 8041697: CompiledScript slower when eval with binding

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8041697/
Bug: https://bugs.openjdk.java.net/browse/JDK-8041697
Related to 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-April/002920.html

Thanks,
-Sundar