RFR: 8246585: ForkJoin updates [v5]

[Martin Buchholz]

> 8246585: ForkJoin updates

Martin Buchholz has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  JDK-8246585

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1646/files
  - new: https://git.openjdk.java.net/jdk/pull/1646/files/b10694b5..cbd81886

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1646&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1646&range=03-04

  Stats: 20983 lines in 878 files changed: 3582 ins; 8199 del; 9202 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