[8u60] Request for approval for JDK-8073707: const re-assignment should not reported as a "early error"

[Hannes Wallnoefer]

Please approve integration of JDK-8073707  for 8u60:

Bug: https://bugs.openjdk.java.net/browse/JDK-8073707
Webrev: http://cr.openjdk.java.net/~hannesw/8073707/
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-February/004220.html

The changes apply cleanly to 8u-dev after reshuffling path names.

Thanks,
Hannes