[jdk21u-dev] RFR: 8308429: jvmti/StopThread/stopthrd007 failed with "NoClassDefFoundError: Could not initialize class jdk.internal.misc.VirtualThreads"

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 0e501f66dfc52a0e049d4fa39c1fcd24f1f2ee4b

Changes: https://git.openjdk.org/jdk21u-dev/pull/1134/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1134&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308429
  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1134.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1134/head:pull/1134

PR: https://git.openjdk.org/jdk21u-dev/pull/1134