[8u] approval request for 8157160: JSON.stringify does not work on ScriptObjectMirror objects

[Sundararajan Athijegannathan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8157160

9 review thread:
http://mail.openjdk.java.net/pipermail/nashorn-dev/2016-May/006179.html

8u webrev: http://cr.openjdk.java.net/~sundar/8157160/8u/webrev.00/

The patch wouldn't apply "as is" because of slight difference in
dynalink/Bootstrap code. I'm CC'ing this email to nashorn-dev as well
for backport review.

Thanks,

-Sundar