RFR: jsr166 integration 2019-09

[Martin Buchholz]

https://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/overview.html

8229442: AQS and lock classes refresh
https://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/lock-classes-refresh/index.html
https://bugs.openjdk.java.net/browse/JDK-8229442

Lock classes refresh is a small step towards loom.
Loom folk, how about adding Doug and I as Loom Project Committers, even
though we have no concrete plans to submit to the loom repo yet?

Another round of stress testing at Google allowed us to fix a handful of
very rare test failures.

8227235: rare failures in testForkHelpQuiesce tck tests
https://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/ForkJoin-quiesce/index.html
https://bugs.openjdk.java.net/browse/JDK-8227235

8221168: java/util/concurrent/CountDownLatch/Basic.java fails
https://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/CountDownLatch-Basic/index.html
https://bugs.openjdk.java.net/browse/JDK-8221168

8145138: CyclicBarrier/Basic.java failed with "3 not equal to 4"
https://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/CyclicBarrier-Basic/index.html
https://bugs.openjdk.java.net/browse/JDK-8145138

8225490: Miscellaneous changes imported from jsr166 CVS 2019-09
https://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/miscellaneous/index.html
https://bugs.openjdk.java.net/browse/JDK-8225490