RFR: 8281560: Matcher.hitEnd returns unexpected results in presence of CANON_EQ flag.

[Ian Graves]

Fixing a bug in `NFCCharProperty` where code falling through an if-statement can prematurely set the matcher's `hitEnd` field to true.

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Commit messages:
 - Catching erronious setting of matcher.hitEnd

Changes: https://git.openjdk.java.net/jdk/pull/7466/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7466&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281560
  Stats: 28 lines in 2 files changed: 27 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7466.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7466/head:pull/7466

PR: https://git.openjdk.java.net/jdk/pull/7466