[8u40] Please approve 8055687: Wrong "this" passed to JSObject.eval call

[A. Sundararajan]

Please approve backport of  8055687: Wrong "this" passed to 
JSObject.eval call

jdk9 webrev: http://cr.openjdk.java.net/~sundar/8055687/webrev.00/
jdk9 changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/3516182f0612
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8055687/8u40/webrev.00/
* changes for source layout
* adding a sample to jdk8u (from jdk9)

Thanks
-Sundar