[8u20] approval request for 8037562: Nashorn: JSON.parse comes up with nonexistent entries if there are gaps between the keys

[A. Sundararajan]

Please approve  backport of fix for JDK-8037562 to 8u20.

Bug: https://bugs.openjdk.java.net/browse/JDK-8037562
Webrev: http://cr.openjdk.java.net/~sundar/8037562/

[same webrev sent for jdk9-dev. Applied "as is" with no changes to 8u20]

Original review request:

http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-March/002839.html

Thanks
-Sundar