RFR: 8273730: WorkGangBarrierSync constructor unused

[Coleen Phillimore]

Please review this trivial change.  This constructor is unused and uses a lock rank that doesn't really mean anything in the jvm.  Built vm with shenandoah and testing with tier1 on Oracle platforms.  Thanks!

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Commit messages:
 - 8273730: WorkGangBarrierSync constructor unused

Changes: https://git.openjdk.java.net/jdk/pull/5508/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5508&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273730
  Stats: 6 lines in 2 files changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5508.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5508/head:pull/5508

PR: https://git.openjdk.java.net/jdk/pull/5508