[8u60] approval request for 8080848: delete of bound Java method property results in crash

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8080848
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-May/004582.html
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8080848/8u60/webrev.00/

Backported "as is" except for the modular source layout difference.

Thanks,
-Sundar