RFR: jsr166 jdk integration 2018-04

[Martin Buchholz]

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

8200728: Docs (Comparison of Stack and Deque methods) for Deque is not
correct' src/main/java/util/Deque.java
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/Deque-Stack/index.html
https://bugs.openjdk.java.net/browse/JDK-8200728

8200520: forkjoin tasks interrupted after shutdown
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/ForkJoinPool-shutdown/index.html
https://bugs.openjdk.java.net/browse/JDK-8200520

8200258: Improve CopyOnWriteArrayList subList code
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/CopyOnWriteArrayList-subList/index.html
https://bugs.openjdk.java.net/browse/JDK-8200258

8197531: Miscellaneous changes imported from jsr166 CVS 2018-04
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/miscellaneous/index.html
https://bugs.openjdk.java.net/browse/JDK-8197531