8371732: [redo] Change java.time month/day field types to 'byte'

[RogerRiggs]

Redo change (8371732) that failed when the updated class objects were incompatible.
The fields of classes are changed to allow a more compact form of storage.

To ensure compatibility of the class objects, the fields are explicitly declared in SerialPersistentFields with the original field types.
The fields are marked transient to indicate the field declarations are not used for serialization.
The affected classes are java.time.LocalDate, MonthDay, and YearMonth.
Tests are added to verify the types and names of serialized fields of each class.

HijrahDate only changes the field types, the fields are transient and there is no change to the serialized from of the HijrahDate.class object.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change requires a CSR request matching fixVersion 26 to be approved (needs to be created)

Issue

• JDK-8371732: [redo] Change java.time month/day field types to 'byte' (Bug - P4)

Reviewers

• Alan Bateman (@AlanBateman - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/28274/head:pull/28274
$ git checkout pull/28274

Update a local copy of the PR:
$ git checkout pull/28274
$ git pull https://git.openjdk.org/jdk.git pull/28274/head

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Checkout this PR locally:
$ git pr checkout 28274

View PR using the GUI difftool:
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https://git.openjdk.org/jdk/pull/28274.diff

Using Webrev

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[bridgekeeper]

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[openjdk]

@RogerRiggs This change is no longer ready for integration - check the PR body for details.

[openjdk]

@RogerRiggs The following labels will be automatically applied to this pull request:

• core-libs
• i18n

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (39d8aa20)

[RogerRiggs]

/label remove i18n

[openjdk]

@RogerRiggs
The i18n label was successfully removed.

[AlanBateman]

Good

[jddarcy]

/csr needed

[openjdk]

@jddarcy has indicated that a compatibility and specification (CSR) request is needed for this pull request.

@RogerRiggs please create a CSR request for issue JDK-8371732 with the correct fix version. This pull request cannot be integrated until the CSR request is approved.