[jdk17u-dev] RFR: 8273430: Suspicious duplicate condition in java.util.regex.Grapheme#isExcludedSpacingMark

[john spurling]

Clean backport. Fixes spacing mark detection in `java.util.regex` for code points `0x1065` and `0x1066`. 

Additional testing:
- [x] test case catches original bug; fails without it
- [x] `JTREG_KEYWORDS="!headful & !external-dep & !printer" make test TEST="tier1 tier2 tier3"` on `linux-aarch64-server-release`: no additional test failures

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Commit messages:
 - Backport 3d9dc8f824abf597d9b28f456cfeb5af927221b8

Changes: https://git.openjdk.org/jdk17u-dev/pull/2731/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2731&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8273430
  Stats: 539 lines in 4 files changed: 147 ins; 388 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2731.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2731/head:pull/2731

PR: https://git.openjdk.org/jdk17u-dev/pull/2731