[jfx23] RFR: 8338478: [macos] Crash in CoreText with certain strings using JDK 22 or later

[Phil Race]

Backport the fix for a crash

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Commit messages:
 - Backport 269d6897e4d4e62beff3a2179dcdabe8a0bf0bc7

Changes: https://git.openjdk.org/jfx/pull/1540/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1540&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338478
  Stats: 87 lines in 1 file changed: 32 ins; 14 del; 41 mod
  Patch: https://git.openjdk.org/jfx/pull/1540.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1540/head:pull/1540

PR: https://git.openjdk.org/jfx/pull/1540