Miscellaneous changes imported from jsr166 CVS 2018-02

Executors.java: delegating ExecutorServices with finalize methods should keep themselves reachable while calling methods on the delegatee

LinkedBlockingQueue: replace the "int c = -1" idiom with slightly cleaner blank finals

tck tests: replace junit's deprecated AssertionFailedError with AssertionError

ArrayBlockingQueue: refactor invariant checking after 8189284: More refactoring for deserialization cases

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