[jdk21u-dev] RFR: 8318605: Enable parallelism in vmTestbase/nsk/stress/stack tests

[Elif Aslan]

Clean backport to unblock parallelism vmTestbase/nsk/stress/stack tests.
GHA tested.
Command below succeeded
make test TEST=vmTestbase/nsk/stress/stack JTREG=REPEAT_COUNT=100

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Commit messages:
 - Backport d9aa1deac8474f87dd867809f7265b9496917c6f

Changes: https://git.openjdk.org/jdk21u-dev/pull/746/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=746&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318605
  Stats: 24 lines in 1 file changed: 0 ins; 24 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/746.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/746/head:pull/746

PR: https://git.openjdk.org/jdk21u-dev/pull/746