RFR: 8288936: Wrong lock ordering writing G1HeapRegionTypeChange JFR event

[Markus Grönlund]

Greetings,

Please help review this adjustment to two JFR locks to avoid lock-ordering problems.

Test: jdk_jfr, reproducers

Thanks
Markus

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Commit messages:
 - 8288936

Changes: https://git.openjdk.org/jdk/pull/15155/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15155&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288936
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15155.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15155/head:pull/15155

PR: https://git.openjdk.org/jdk/pull/15155