RFR: 8273206: jdk/jfr/event/gc/collection/TestG1ParallelPhases.java fails after JDK-8159979

[Jie Fu]

8273206: jdk/jfr/event/gc/collection/TestG1ParallelPhases.java fails after JDK-8159979

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Commit messages:
 - 8273206: jdk/jfr/event/gc/collection/TestG1ParallelPhases.java fails after JDK-8159979

Changes: https://git.openjdk.java.net/jdk/pull/5322/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5322&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273206
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5322.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5322/head:pull/5322

PR: https://git.openjdk.java.net/jdk/pull/5322