[jdk21u] RFR: 8316879: RegionMatches1Tests fails if CompactStrings are disabled after JDK-8302163

Fri Sep 29 16:34:56 UTC 2023

Clean backport of JDK-8316879.

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Commit messages:
 - Backport cfcbfc6cae7d8fc276c5a54917e97adea7cf5621

Changes: https://git.openjdk.org/jdk21u/pull/216/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=216&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316879
  Stats: 29 lines in 2 files changed: 21 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u/pull/216.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/216/head:pull/216

PR: https://git.openjdk.org/jdk21u/pull/216