RFR: jsr166 jdk integration 2018-05

[Martin Buchholz]

Time to do this, since Claes is also touching ArrayList.

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

8202685: Improve ArrayList replaceAll
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/replaceAll/index.html
https://bugs.openjdk.java.net/browse/JDK-8202685

8201386: Miscellaneous changes imported from jsr166 CVS 2018-05
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/miscellaneous/index.html
https://bugs.openjdk.java.net/browse/JDK-8201386