RFR: 8274312: ProblemList 2 serviceability/dcmd/gc tests with ZGC on macOS-all

[Daniel D.Daugherty]

A trivial fix to ProblemList 2 serviceability/dcmd/gc tests with ZGC on macOS-all.

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Commit messages:
 - 8274312: ProblemList 2 serviceability/dcmd/gc tests with ZGC on macos-all

Changes: https://git.openjdk.java.net/jdk/pull/5691/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5691&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274312
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5691.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5691/head:pull/5691

PR: https://git.openjdk.java.net/jdk/pull/5691