[jdk17u-dev] RFR: 8269032: Stringdedup tests are failing if the ergonomically select GC does not support it

[Goetz Lindenmaier]

I want to backport this test-only change to simplify follow up backports.

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Commit messages:
 - Backport 3fc761d97d43429d3fdc0646835c462e0fe1bd3e

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/105/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=105&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269032
  Stats: 90 lines in 7 files changed: 78 ins; 0 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/105.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/105/head:pull/105

PR: https://git.openjdk.java.net/jdk17u-dev/pull/105