RFR: 8345970: pthread_getcpuclockid related crashes in shenandoah tests [v2]

[William Kemper]

> I haven't seen this failure mode in our Alpine Linux test pipelines, but the suggestion to avoid getting cpu time for terminated threads sounds sensible.

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Stop periodic mmu task before stopping GC threads

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22693/files
  - new: https://git.openjdk.org/jdk/pull/22693/files/c3b93aec..e99aaa5f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22693&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22693&range=00-01

  Stats: 16 lines in 3 files changed: 13 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22693.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22693/head:pull/22693

PR: https://git.openjdk.org/jdk/pull/22693