[jdk18u] RFR: 8281638: jfr/event/allocation tests fail with release VMs after JDK-8281318 due to lack of -XX:+UnlockDiagnosticVMOptions

[Aleksey Shipilev]

Follow-up for JDK-8281318 backport.

Additional testing: 
 - [x] Linux x86_32 fastdebug, affected tests pass
 - [x] Linux x86_32 release, affected tests pass

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Depends on: https://git.openjdk.java.net/jdk18u/pull/42

Commit messages:
 - Backport d254cf28c5e72bd9b8de863b831015237640ca25

Changes: https://git.openjdk.java.net/jdk18u/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=43&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281638
  Stats: 8 lines in 3 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/43/head:pull/43

PR: https://git.openjdk.java.net/jdk18u/pull/43