[lworld] RFR: 8329205: [lworld] Add jdk.internal.value.CheckedType API [v2]

[Mandy Chung]

On Wed, 27 Mar 2024 18:48:13 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> This PR adds `jdk.internal.value.CheckedType` and other internal APIs for null-restricted value type and array support.   Also rename `Unsafe::isFlattenedArray` to `Unsafe::isFlatArray`.
>
> Mandy Chung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   misc clean up

Yes, agree.   The API needs additional argument checking and will update it.

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PR Comment: https://git.openjdk.org/valhalla/pull/1065#issuecomment-2024074862