RFR: 8283465: Character.UnicodeBlock.NUM_ENTITIES is out of date

[Naoto Sato]

Fixing the out-of-date number of entries in `Character.UnicodeBlock.NUM_ENTITIES` field. The regression test has been renamed and now repurposed just to examine whether the `NUM_ENTITIES` correctly has the `map.size()` value.

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Commit messages:
 - 8283465: Character.UnicodeBlock.NUM_ENTITIES is out of date

Changes: https://git.openjdk.java.net/jdk/pull/7909/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7909&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283465
  Stats: 125 lines in 3 files changed: 50 ins; 73 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7909.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7909/head:pull/7909

PR: https://git.openjdk.java.net/jdk/pull/7909