RFR: 8350457: Implement JEP 519: Compact Object Headers [v4]

[Roman Kennke]

On Wed, 21 May 2025 11:32:23 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> As title says.
>
> Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8350457
>  - Build COH CDS archives
>  - Remove +UnlockExperimentalOptions from tests
>  - 8350457: Support Compact Object Headers as product option

JEP has been targeted, I think it is ready to go.

Thank you all!

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PR Comment: https://git.openjdk.org/jdk/pull/24522#issuecomment-2900766164