RFR: 8246585: ForkJoin updates [v2]

[Martin Buchholz]

> 8246585: ForkJoin updates

Martin Buchholz has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new 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/0ae46847..d025f68b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1646&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1646&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 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