RFR: 8246585: ForkJoin updates

[Martin Buchholz]

8246585: ForkJoin updates

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Commit messages:
 - JDK-8246585

Changes: https://git.openjdk.java.net/jdk/pull/1646/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1646&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8246585
  Stats: 3114 lines in 6 files changed: 1135 ins; 890 del; 1089 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1646.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1646/head:pull/1646

PR: https://git.openjdk.java.net/jdk/pull/1646