RFR: 8300916: Re-examine the initialization of JNU Charset in StaticProperty [v4]

[Naoto Sato]

On Wed, 25 Jan 2023 18:45:04 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This issue was found during the review of this PR: https://github.com/openjdk/jdk/pull/12132 where `Charset` class was loaded/initialized at the phase 1 of the startup process. Since `Charset` depends on `StaticProperty`, loading of `Charset` class should be delayed. I basically moved cache for `jnuCharset` into the actual calling locations `ProcessImpl` and `ProcessEnvironment` for unix platforms so that initPhase1() won't initialize `Charset` class.
>> Unrelated, but I replaced `Locale.ENGLISH` with `Locale.ROOT` in the argument of `toLowerCase()`.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use standardProvider to determine the default charset

`Charset.defaultCharset()` now uses `standardProvider.charsetForName(<file.encoding>)` charset.

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PR: https://git.openjdk.org/jdk/pull/12171