RFR: 8313654: Test WaitNotifySuspendedVThreadTest.java timed out [v2]

[Leonid Mesnik]

> Test might times out if it suspend thread before it starts breakpoint event handler.
> The fix is to replace sleep with better synchronization and suspend virtual thread only when it runs native code.
> 
> Also, the completed monitor is acquired earlier to avoid racing when completing test.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  fix

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15196/files
  - new: https://git.openjdk.org/jdk/pull/15196/files/53bb6235..303a4f60

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15196&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15196&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15196.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15196/head:pull/15196

PR: https://git.openjdk.org/jdk/pull/15196