RFR: 8274312: ProblemList 2 serviceability/dcmd/gc tests with ZGC on macos-all [v2]

[Daniel D.Daugherty]

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

Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:

  8274313: ProblemList sun/tools/jmap/BasicJMapTest.java subtests

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5691/files
  - new: https://git.openjdk.java.net/jdk/pull/5691/files/7d5c636a..c53c1cce

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5691&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5691&range=00-01

  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 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