RFR: 8299419: Thread.sleep(millis) may throw OOME

[Viktor Klang]

This PR applies @AlanBateman's patch from the JBS issue.

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Commit messages:
 - Hardening Thread::beforeSleep to not be able to throw OOME as per Alan Batemans ThreadSleepEvent.patch

Changes: https://git.openjdk.org/jdk/pull/20923/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20923&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299419
  Stats: 19 lines in 2 files changed: 3 ins; 11 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/20923.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20923/head:pull/20923

PR: https://git.openjdk.org/jdk/pull/20923