RFR: 8326957: Implement JEP 474: ZGC: Generational Mode by Default [v6]

[Stefan Karlsson]

On Tue, 14 May 2024 11:23:31 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>> This is the implementation task for `JEP 474: ZGC: Generational Mode by Default`. See the JEP for details. [JDK-8326667](https://bugs.openjdk.org/browse/JDK-8326667)
>
> Axel Boldt-Christmas has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits:
> 
>  - Merge remote-tracking branch 'upstream_jdk/master' into JDK-8326957
>  - Revert "Default to non generational ZGC with JVMCI"
>    
>    This reverts commit 4de30da2661c64ae00d13a5e15a1a61fcb667a10.
>  - Default to non generational ZGC with JVMCI
>  - Merge tag 'jdk-23+21' into JDK-8326957
>    
>    Added tag jdk-23+21 for changeset e833bfc8
>  - Merge tag 'jdk-23+19' into JDK-8326957
>    
>    Added tag jdk-23+19 for changeset 706b421c
>  - Remove extra space
>  - Use consistent terminology
>  - Merge tag 'jdk-23+17' into JDK-8326957
>    
>    Added tag jdk-23+17 for changeset 8efd7aa6
>  - Merge tag 'jdk-23+16' into JDK-8326957
>    
>    Added tag jdk-23+16 for changeset d580bcf9
>  - Update VMDeprecatedOptions.java test
>  - ... and 1 more: https://git.openjdk.org/jdk/compare/5ded8da6...60460dce

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18393#pullrequestreview-2055065442