RFR: 8316682: serviceability/jvmti/vthread/SelfSuspendDisablerTest timed out [v8]

[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.

Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision:

  review: some minor refactoring for parameter update_vthread_list

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24269/files
  - new: https://git.openjdk.org/jdk/pull/24269/files/b2c413a7..0a29d0b5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24269&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24269&range=06-07

  Stats: 27 lines in 5 files changed: 1 ins; 0 del; 26 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