Integrated: 8268574: ProblemList tests failing due to UseBiasedLocking going away

[Daniel D.Daugherty]

A trivial fix to ProblemList tests failing due to UseBiasedLocking going away

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Commit messages:
 - 8268574: ProblemList tests failing due to UseBiasedLocking going away

Changes: https://git.openjdk.java.net/jdk/pull/4469/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4469&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268574
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4469.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4469/head:pull/4469

PR: https://git.openjdk.java.net/jdk/pull/4469