RFR: jsr166 jdk integration 2018-02

[Martin Buchholz]

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

8190324: ThreadPoolExecutor should not specify a dependency on finalization
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/ThreadPoolExecutor-finalize/index.html
https://bugs.openjdk.java.net/browse/JDK-8190324

Another set of uninteresting changes, some suggested by intellij:

8195590: Miscellaneous changes imported from jsr166 CVS 2018-02
http://cr.openjdk.java.net/~martin/webrevs/jdk/jsr166-integration/miscellaneous/index.html
https://bugs.openjdk.java.net/browse/JDK-8195590