[jdk21u-dev] RFR: 8283223: gc/stringdedup/TestStringDeduplicationFullGC.java#Parallel failed with "RuntimeException: String verification failed"

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport 9d441e3e56e733d64dbadde6854761e4545c1c70

Changes: https://git.openjdk.org/jdk21u-dev/pull/765/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=765&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8283223
  Stats: 44 lines in 1 file changed: 32 ins; 4 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/765.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/765/head:pull/765

PR: https://git.openjdk.org/jdk21u-dev/pull/765