RFR: 8352178: Add precondition in VMThread::execute to prevent deadlock [v3]

[Albert Mingkun Yang]

> Simple patch of adding `SuspendibleThreadSet` related precondition to `Handshake::execute` in order to prevent deadlock.
> All existing callsites satisfy this precondition already.
> 
> Test: tier1-5

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24088/files
  - new: https://git.openjdk.org/jdk/pull/24088/files/7480c141..3d727bca

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24088&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24088&range=01-02

  Stats: 17 lines in 2 files changed: 7 ins; 9 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24088.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24088/head:pull/24088

PR: https://git.openjdk.org/jdk/pull/24088