[7u40] Request for approval : 7164256 : EnumMap clone doesn't clear the entrySet keeping a reference to the original Map

[Seán Coffey]

I'd like to port this back to 7u. Changeset applies without issue.
bug report : http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7164256
jdk8 changeset : http://hg.openjdk.java.net/jdk8/tl/jdk/rev/757a5129fad7
JDK 8 review thread : 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-May/010320.html

regards,
Sean.