RFR: jsr166 jdk10 integration wave 4

[Martin Buchholz]

This wave introduces a more clickable overview Home Page:

http://cr.openjdk.java.net/~martin/webrevs/openjdk10/jsr166-integration/overview.html

8188900: ConcurrentLinkedDeque linearizability
8188853: java/util/concurrent/ExecutorService/Invoke.java Assertion failure
8188047: Add SplittableRandom.nextBytes
8187941: Add StampedLock stamp inspection methods
8188575: Miscellaneous changes imported from jsr166 CVS 2017-10