RFR: 8314905: jdk/jfr/tool/TestView.java fails with RuntimeException 'Invoked Concurrent' missing from stdout/stderr

[Erik Gahlin]

Could I have a review of a test fix? The test now uses a more predictable event than the SystemGC event. 

Testing: jdk/jfr/tool/TestView.java

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/15513/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15513&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314905
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/15513.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15513/head:pull/15513

PR: https://git.openjdk.org/jdk/pull/15513