[jdk21u-dev] RFR: 8307778: com/sun/jdi/cds tests fail with jtreg's Virtual test thread factory

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport fe8a2aff3129b515c2a0f3ab96f5e3ad6cef7b70

Changes: https://git.openjdk.org/jdk21u-dev/pull/776/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=776&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307778
  Stats: 5 lines in 2 files changed: 0 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/776.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/776/head:pull/776

PR: https://git.openjdk.org/jdk21u-dev/pull/776