RFR: 8315968: Move java.util.Digits to jdk.internal.util and refactor to reduce duplication [v19]

[Chen Liang]

On Tue, 12 Sep 2023 13:27:29 GMT, 温绍锦 <duke at openjdk.org> wrote:

>> Some codes in core libs are duplicated, including:
>> java.util.DecimalDigits::DIGITS -> java.lang.StringLatin1.PACKED_DIGITS
>> java.util.DecimalDigits::size -> java.lang.Long.stringSize
>> 
>> We can reduce duplication through JavaLangAccess, which is also needed in other places, such as:
>> https://github.com/openjdk/jdk/pull/15555
>
> 温绍锦 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   little-endian

I have updated the JBS bug title and explicitly stated the actions in this patch:
1. Move Digits to jdk.internal.util
2. Keep the tables in DecimalDigits and access via a new digitPair static method
3. Change the DecimalDigits' table to be LE (instead of BE) and update implementation

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PR Comment: https://git.openjdk.org/jdk/pull/15651#issuecomment-1715829791