RFR: 8316426: Optimization for HexFormat.formatHex [v8]

[温绍锦]

On Wed, 27 Sep 2023 13:35:55 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> 温绍锦 has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   reduce the size of HexFormat##DIGITS, from 256 to 128
>
> It is conventional to get re-reviews of any change and give the reviewers that taken the time to review the PR a chance to review any subsequent changes.

@RogerRiggs Can this PR be added to /sponsor now?

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PR Comment: https://git.openjdk.org/jdk/pull/15768#issuecomment-1750574495