8171886: Miscellaneous changes imported from jsr166 CVS 2017-02Reviewed-by: martin, psandoz
8078645: removeIf(filter) in ConcurrentHashMap removes entries for which filter is falseReviewed-by: martin, dholmesContributed-by: Doug Lea <dl@cs.oswego.edu>, Paul Sandoz <paul.sandoz@oracle.com>