RFR: 8217501: Matcher.hitEnd returns false for incomplete surrogate pairs

[Ian Graves]

Fixing a bug where character matcher doesn't mark hitEnd as true if it's a code point with more than one character.

-------------

Commit messages:
 - 8217501: Matcher.hitEnd returns false for incomplete surrogate pairs

Changes: https://git.openjdk.java.net/jdk/pull/5725/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5725&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8217501
  Stats: 26 lines in 2 files changed: 26 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5725.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5725/head:pull/5725

PR: https://git.openjdk.java.net/jdk/pull/5725