RFR: 8316682: serviceability/jvmti/vthread/SelfSuspendDisablerTest timed out

[Serguei Spitsyn]

This fixes the issue with lack of synchronization between JVMTI thread suspend and resume functions in a self-suspend case. More detailed fix description is in the first PR comment.

Testing: Ran mach5 tiers 1-6.

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Commit messages:
 - 8316682: serviceability/jvmti/vthread/SelfSuspendDisablerTest timed out

Changes: https://git.openjdk.org/jdk/pull/24269/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24269&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316682
  Stats: 121 lines in 9 files changed: 69 ins; 33 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/24269.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24269/head:pull/24269

PR: https://git.openjdk.org/jdk/pull/24269