[jdk17u-dev] RFR: 8293252: Shenandoah: ThreadMXBean synchronizer tests crash with aggressive heuristics

[William Kemper]

Testing:

- [ ] hotspot_gc_shenandoah
- [ ] dacapo
- [ ] extremem
- [ ] specjbb2015
- [ ] hyperalloc

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Commit messages:
 - Backport 3675f4c2afd10b5042948fc79e62caee5f3874ce

Changes: https://git.openjdk.org/jdk17u-dev/pull/1449/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1449&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293252
  Stats: 16 lines in 3 files changed: 10 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1449.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1449/head:pull/1449

PR: https://git.openjdk.org/jdk17u-dev/pull/1449