RFR: 8273430: Suspicious duplicate condition in java.util.regex.Grapheme#isExcludedSpacingMark

[Ian Graves]

The duplicate condition in this chain of expressions needs to be shrunk to drop a couple of character that are not excluded spacing marks.

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Commit messages:
 - 8273430: Suspicious duplicate condition in java.util.regex.Grapheme#isExcludedSpacingMark

Changes: https://git.openjdk.java.net/jdk/pull/5425/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5425&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273430
  Stats: 10 lines in 2 files changed: 7 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5425.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5425/head:pull/5425

PR: https://git.openjdk.java.net/jdk/pull/5425