[jdk25u] RFR: 8360255: runtime/jni/checked/TestLargeUTF8Length.java fails with -XX:-CompactStrings

[Aleksey Shipilev]

Fixes the test with `-XX:-CompactStrings`.

Additional testing:
 - [x] MacOS AArch64 server fastdebug, affected test fails before the patch, passes with it

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Commit messages:
 - Backport 1ca008fd02496dc33e2707c102560cae1690fba5

Changes: https://git.openjdk.org/jdk25u/pull/65/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=65&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360255
  Stats: 8 lines in 1 file changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk25u/pull/65.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/65/head:pull/65

PR: https://git.openjdk.org/jdk25u/pull/65