RFR: 8334742: Change java.time month/day field types to 'byte' [v2]

[Roger Riggs]

On Wed, 30 Apr 2025 20:38:59 GMT, Gautham Krishnan <duke at openjdk.org> wrote:

>> In the following classes, month and day values are stored in fields of type 'int' or 'short'. The range of allowed values is small enough that the type can be 'byte' instead.
>> 
>> java.time.YearMonth
>> java.time.MonthDay
>> java.time.LocalDate
>> java.time.chono.HijrahDate
>> 
>> Refactoring the type will give the JVM a little more layout flexibility, and will be especially useful when these classes become value classes.
>
> Gautham Krishnan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updating copyright header

Looks good

Passed CI tier 1-3.

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24975#pullrequestreview-2872433491
PR Comment: https://git.openjdk.org/jdk/pull/24975#issuecomment-2913852479