<i18n dev> RFR: 8301119: Support for GB18030-2022 [v3]

[Alan Bateman]

On Thu, 23 Feb 2023 19:34:44 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Upgrading the GB18030 charset in the JDK to the latest 2022 standard. Since this is not a compatible upgrade to the existing mapping, a new system property `jdk.charset.GB18030` is introduced. If it is set to "2000", the mapping falls back to the existing mapping based on the 2000 standard, otherwise, it defaults to 2022 mapping. Refer to the corresponding CSR for more detail.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Moved the 2000 flag into GB18030

Latest version looks good to me, avoids needing stable field or holder class.

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Marked as reviewed by alanb (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12518