[8u20] approval request for 8042364: Make __proto__ ES6 draft compliant

[A. Sundararajan]

Hi,

Please approve backport for fix for 8042364: Make __proto__ ES6 draft 
compliant. Patch from jdk9 is applied "as is" with no changes.

Bug: https://bugs.openjdk.java.net/browse/JDK-8042364
Webrev: http://cr.openjdk.java.net/~sundar/8042364/
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-May/002947.html

Thanks
-Sundar