[jdk25u] RFR: 8368670: Deadlock in JFR on event register + class load

[Erik Gahlin]

8368670: Deadlock in JFR on event register + class load

-------------

Commit messages:
 - Backport 5fccabff15ae8bcc3d03156fa331bbc0fefb0cbe

Changes: https://git.openjdk.org/jdk25u/pull/298/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=298&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368670
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u/pull/298.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/298/head:pull/298

PR: https://git.openjdk.org/jdk25u/pull/298