RFR: 8319456: jdk/jfr/event/gc/collection/TestGCCauseWith[Serial|Parallel].java : GC cause 'GCLocker Initiated GC' not in the valid causes

[Thomas Schatzl]

Hi all,

  please review these fixes to the `jdk/jfr/event/gc/collection/TestGCCauseWith[Serial|Parallel].java` tests that fail if the GC cause has been "GCLocker Initiated GC".

This is a valid gc cause, just extremely rare (interestingly the corresponding G1 tests added it).

Thanks,
  Thomas

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Commit messages:
 - 8319456

Changes: https://git.openjdk.org/jdk/pull/16542/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16542&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319456
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16542.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16542/head:pull/16542

PR: https://git.openjdk.org/jdk/pull/16542