RFR: jsr166 jdk9 integration wave 10

[Martin Buchholz]

http://cr.openjdk.java.net/~martin/webrevs/openjdk9/jsr166-jdk9-integration/

Mostly docs and tests.

jsr166 CVS is now caught up with jdk9+135

Paul, I think we need to update AtomicInteger for VarHandle#getAndAdd:

http://cr.openjdk.java.net/~martin/webrevs/openjdk9/jsr166-jdk9-integration/miscellaneous/src/java.base/share/classes/java/util/concurrent/atomic/AtomicInteger.java.udiff.html