RFR: 8343218: Add option to disable allocating interface and abstract classes in non-class metaspace [v2]

[Coleen Phillimore]

On Mon, 4 Aug 2025 18:41:20 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This change introduces a diagnostic flag to disable the change to allocate interface and abstract Klass metadata in the non-class metaspace.  Testing for JDK 25 has completed with this feature in place, but there may be cases where we should disable this.  A future change will be to remove this code.
>> Tested with tier1-4 with the flag off, and 1-4 with the flag on.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Apply Yudi patch for graal.

Thank you Aleksey,Thomas, David, Vladimir and Yudi.

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PR Comment: https://git.openjdk.org/jdk/pull/26579#issuecomment-3152434736