Code Review 6993789: LinkedBlockingDeque iterator/descendingIterator loops and owns lock forever

[Chris Hegarty]

Doug, David,

This webrev contains the fix for CR 6993789: "LinkedBlockingDeque 
iterator/descendingIterator loops and owns lock forever", and also 
contains some other minor changes that we inherit for free when syncing 
to the latest LBQ in Dougs CVS, "optimize toString methods", and "Move 
more allocations outside of locks to reduce footprint".

Webrev:
   http://cr.openjdk.java.net/~chegar/6993789/webrev.00/webrev/

Thanks,
-Chris.