RFR: 8314515: java/util/concurrent/SynchronousQueue/Fairness.java failed with "Error: fair=false i=8 j=0"

[Martin Buchholz]

The usual tiny improvements, with no guarantee that the intermittent test failure is actually fixed.

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Commit messages:
 - JDK-8314515

Changes: https://git.openjdk.org/jdk/pull/15337/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15337&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314515
  Stats: 29 lines in 1 file changed: 7 ins; 3 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/15337.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15337/head:pull/15337

PR: https://git.openjdk.org/jdk/pull/15337