[lworld] RFR: 8301720: Add the PreviewFeature "VALUE_OBJECTS" and annotate new APIs.

[Mandy Chung]

On Fri, 3 Feb 2023 15:29:25 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Add the PreviewFeature for value objects and annotate new APIs.
> (Any restrictions on use of the APIs will come later.)

src/java.base/share/classes/java/lang/Class.java line 636:

> 634:      * @since Valhalla
> 635:      */
> 636:     @PreviewFeature(feature = PreviewFeature.Feature.VALUE_OBJECTS)

I only expect `@PreviewFeature` on public APIs.   No need to mark the package private methods as they are implementation details.

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PR: https://git.openjdk.org/valhalla/pull/819