[8u20] approval request for 8044750: megamorphic getter for scope objects does not call __noSuchProperty__ hook

[A. Sundararajan]

Please approve backport. patch would not apply "as is" for one file 
(ScriptObject.java) - had to manually apply the diffs. Including jdk9 
reviewers in this email.

Bug: https://bugs.openjdk.java.net/browse/JDK-8044750
jdk8u20 webrev: http://cr.openjdk.java.net/~sundar/8044750/8u20/webrev.00/
jdk9 webrev: http://cr.openjdk.java.net/~sundar/8044750/webrev.00/
jdk9 review thread: 
mail.openjdk.java.net/pipermail/nashorn-dev/2014-June/003044.html
jdk9 changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/fd14a4b555f7

Thanks
-Sundar