[jdk11u-dev] RFR: 8214427: probable bug in logic of ConcurrentHashMap.addCount()

[Andrew John Hughes]

Hi all,

This pull request contains a backport of commit [88461599](https://github.com/openjdk/jdk/commit/8846159987f902bb6e2b966eb4656da4b6d9469d) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.

The commit being backported was authored by Doug Lea on 12 Dec 2018 and was reviewed by Martin Buchholz and David Holmes.

All 108 `java.util.concurrent` tests passed with the patch applied.

Thanks!

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Commit messages:
 - Backport 8846159987f902bb6e2b966eb4656da4b6d9469d

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1114/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1114&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8214427
  Stats: 9 lines in 1 file changed: 0 ins; 2 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1114.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1114/head:pull/1114

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1114