[jdk8u-dev] RFR: 8305681: Allow additional characters for GB18030-2022 (Level 2) support

[Naoto Sato]

This is a backport of GB18030 Level 2 part of the JSR337 MR5 (https://jcp.org/aboutJava/communityprocess/mrel/jsr337/index5.html) Reference Implementation

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Depends on: https://git.openjdk.org/jdk8u-dev/pull/314

Commit messages:
 - 8305681: Allow additional characters for GB18030-2022 (Level 2) support

Changes: https://git.openjdk.org/jdk8u-dev/pull/315/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=315&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305681
  Stats: 55 lines in 6 files changed: 37 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/315.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/315/head:pull/315

PR: https://git.openjdk.org/jdk8u-dev/pull/315