Merge

5063507: (fmt) missing exception for "%#s" format specifier Summary: throw appropriate exception when necessary Reviewed-by: alanb

6805775: LinkedBlockingQueue Nodes should unlink themselves before becoming garbage 6815766: LinkedBlockingQueue's iterator can return null if drainTo(c) executes concurrently Summary: Faster, more correct. Use self-linking trick to avoid gc retention Reviewed-by: martin, dholmes