RFR: 8309760: ProblemList serviceability/jvmti/vthread/FollowReferences/VThreadStackRefTest.java#default with ZGC

[Daniel D. Daugherty]

8309760: ProblemList serviceability/jvmti/vthread/FollowReferences/VThreadStackRefTest.java#default with ZGC

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

Commit messages:
 - Backport aace3dc28c577bae67a6a1d376a514740d752928

Changes: https://git.openjdk.org/jdk21/pull/5/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=5&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309760
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/5/head:pull/5

PR: https://git.openjdk.org/jdk21/pull/5