[jdk21u-dev] RFR: 8321933: TestCDSVMCrash.java spawns two processes

[Amos Shi]

Backport of [JDK-8321933](https://bugs.openjdk.org/browse/JDK-8321933)

Testing
- Local: Test passed
  - `TestCDSVMCrash.java`: Test results: passed: 1
- Pipeline: 
- Testing Machine:

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Commit messages:
 - Backport 1fde8b868a0e40fb79de505106ef07e3dccbd1de

Changes: https://git.openjdk.org/jdk21u-dev/pull/755/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=755&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321933
  Stats: 33 lines in 1 file changed: 1 ins; 6 del; 26 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/755.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/755/head:pull/755

PR: https://git.openjdk.org/jdk21u-dev/pull/755