[jdk20u] RFR: 8306774: Make runtime/Monitor/GuaranteedAsyncDeflationIntervalTest.java more reliable

Tue May 2 09:05:35 UTC 2023

Backport the test reliability fix. The backport was not clean, because there was a conflict in `ProblemList` that took the test away from it. I saw no point in backporting the unclean addition to the problem-list, so this PR just omits any changes to a problemlist.

Additional testing: 
 - [x] macos-aarch64-server-fastdebug, `runtime/Monitor`

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Depends on: https://git.openjdk.org/jdk20u/pull/61

Commit messages:
 - Backport 9ad6dc881d285cc26c136f0ef19af5bac0a75022

Changes: https://git.openjdk.org/jdk20u/pull/70/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=70&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306774
  Stats: 30 lines in 1 file changed: 19 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk20u/pull/70.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/70/head:pull/70

PR: https://git.openjdk.org/jdk20u/pull/70