RFR: 8287103: java/lang/management/ThreadMXBean/VirtualThreadDeadlocks.java fails with Xcomp

[Leonid Mesnik]

Sync improved in test

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Commit messages:
 - 8287103: java/lang/management/ThreadMXBean/VirtualThreadDeadlocks.java fails with Xcomp

Changes: https://git.openjdk.java.net/jdk/pull/8821/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8821&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287103
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8821.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8821/head:pull/8821

PR: https://git.openjdk.java.net/jdk/pull/8821