[8u60] please approve 8072752: Add regression tests for 8071678 and 8071594

[A. Sundararajan]

Hi,

Bug:  https://bugs.openjdk.java.net/browse/JDK-8072752
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8072752/8u60/webrev.00/
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-February/004163.html

backported 'as is' without any jdk8u specific changes.

Thanks,
-Sundar