RFR: 8311207: Cleanup for Optimization for UUID.toString [v12]

[温绍锦]

On Fri, 8 Sep 2023 18:59:09 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> This request got buried in a "resolved" comment:
> 
> > A description of the DIGITS array layout and indexing is needed; it will help with the comprehension of the masking and shifts in the packDigits methods.
> 
> The DIGITS table is missing a description of its indexing.

Sorry, I have already added the description of DIGITS

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PR Comment: https://git.openjdk.org/jdk/pull/14745#issuecomment-1712157546