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

[Aleksey Shipilev]

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.

Let's go!

-------------

Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26579#pullrequestreview-3085368923