RFR: 8263677: Improve Character.isLowerCase/isUpperCase lookups [v2]

[Claes Redestad]

> This patch changes the otherLowercase / otherUppercase bits to be set if either the codepoint is of type LOWERCASE_LETTER and UPPERCASE_LETTER, or the Unicode Other_Lowercase / Other_Uppercase property is set. This simplifies the lookup in Character.isLowerCase/isUpperCase to a single table lookup, which appears to be healthy for performance.
> 
> I also took the opportunity to clean up the somewhat dated GenerateCharacter utility class.
> 
> Testing: tier1-3

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Roger review + additional cleanups

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3028/files
  - new: https://git.openjdk.java.net/jdk/pull/3028/files/5dc70a95..5698b88c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3028&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3028&range=00-01

  Stats: 27 lines in 1 file changed: 2 ins; 8 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3028.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3028/head:pull/3028

PR: https://git.openjdk.java.net/jdk/pull/3028