[8u60] approval request for 8079470: Misleading error message when explicit signature constructor is called with wrong arguments

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8079470
8u60 webrev: http://cr.openjdk.java.net/~sundar/8079470/8u60/webrev.00/
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-May/004491.html

Thanks,
-Sundar