RFR: 8358294: Remove unnecessary GenAlignment [v2]

[Albert Mingkun Yang]

On Tue, 10 Jun 2025 17:47:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple replacement of `GenAlignment` with `SpaceAlignment`, because they always have the same value. Removing the former to reduce complexity.
>> 
>> Test: tier1-3
>
> Albert Mingkun Yang 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 two additional commits since the last revision:
> 
>  - Merge branch 'master' into remove-gen-alignment
>  - remove-gen-alignment

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/25577#issuecomment-2960461165