RFR: 8368845: x-IBM930 uses incorrect character for Hex 42 60 [v2]

[Naoto Sato]

> Fixing a charset en/decoder for x-IBM930. There was a "temporary" mapping for the said code point for the backward compatibility (as of  JDK7). Since the issue requests the "correct" mapping, I believe we can replace the temporary one with the correct mapping.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  added bugid to the tests

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27594/files
  - new: https://git.openjdk.org/jdk/pull/27594/files/bd338444..30ba5ce5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27594&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27594&range=00-01

  Stats: 7 lines in 3 files changed: 1 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/27594.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27594/head:pull/27594

PR: https://git.openjdk.org/jdk/pull/27594