[lworld] RFR: 8371357: [lworld] Remove EnableValhalla [v6]

[Stefan Karlsson]

On Tue, 16 Dec 2025 16:23:12 GMT, Paul Hübner <phubner at openjdk.org> wrote:

>> Hi all,
>> 
>> This removes the `EnableValhalla` in favour of the `--enable-preview` flag. Concretely:
>> * I've replaced most of the `EnableValhalla` checks with `Arguments::is_valhalla_enabled()`. 
>> * Some checks were redundant and could be removed entirely.
>> * I've made the `EnableValhalla` flag obsolete.
>> * Some tests had to be updated.
>> 
>> This greatly changes the semantics of tests. I've refined some test groups to make it easier.
>> 
>> Testing: tiers 1-4.
>
> Paul Hübner has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 26 commits:
> 
>  - Merge branch 'lworld' into JDK-8371357
>  - Merge branch 'lworld' into JDK-8371357
>  - Reviewer comments.
>  - Use the new function for the Parallel changes.
>  - Merge branch 'lworld' into JDK-8371357
>  - Remove wrong comment.
>  - Fix imports.
>  - Reviewer comments.
>  - Copyright.
>  - Revert "Don't synchronize on Double."
>    
>    This reverts commit cbf849c2ce6059af2b43b3dd8cb42445eab4df2b.
>  - ... and 16 more: https://git.openjdk.org/valhalla/compare/ef301b76...6eae2446

Marked as reviewed by stefank (Author).

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PR Review: https://git.openjdk.org/valhalla/pull/1759#pullrequestreview-3583961936