reRFR: 4802647 : NullPointerException not thrown by AbstractCollection.retainAll/removeAll

[Mike Duigou]

Hello all;

Long, long ago, Brandon Passanisi proposed a fix to correct non-conformant implementation of retainAll/removeAll(). It was reviewed but was never committed to TL repo (it got lost amidst Christmas vacation and other matters). Rather than surprise everyone with a rogue changeset they may have forgotten I'm reposting the review webrev and giving everyone a chance to change their mind. 

http://cr.openjdk.java.net/~mduigou/JDK-4802647/0/webrev/

Hearing no objections I will push this in about 24 hours.

Mike