<i18n dev> RFR: 8300489: Use ArraysSupport.vectorizedHashCode in j.l.CharacterName

Wed Jan 18 11:12:58 UTC 2023

This patch makes use of `ArraysSupport.vectorizedHashCode` and helps verify the performance win also for range-based hash calculations. Also modernized and cleaned up the surrounding code somewhat. 

Benchmark                          Mode  Cnt    Score   Error  Units
Characters.CodePoints.codePointOf  avgt   15  153.753 ± 6.119  ns/op
Characters.CodePoints.codePointOf  avgt   15  134.753 ± 4.386  ns/op # after, 1.14x

For C1 and C2 on non-x86 platforms the performance is neutral. Interpreter sees a 1-2% regression due a few added calls.

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Commit messages:
 - 8300489: Use ArraysSupport.vectorizedHashCode in j.l.CharacterName

Changes: https://git.openjdk.org/jdk/pull/12068/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12068&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300489
  Stats: 30 lines in 2 files changed: 15 ins; 5 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/12068.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12068/head:pull/12068

PR: https://git.openjdk.org/jdk/pull/12068