RFR: 8365823: Revert storing abstract and interface Klasses to non-class metaspace

[Coleen Phillimore]

On Mon, 15 Sep 2025 13:28:45 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This change removes the optimization to not store abstract and interface Klass metadata to non-class metaspace.  Now all Klass metadata is in the Klass metaspace.  This is simpler and less bug prone, and didn't help with the limitation of classes that can be stored in class metaspace materially.
> Tested with tier1-4.

The JFR changes were a slight refactoring, so I don't think they need to be changed back.  The ClassFileParser.is_abstract() function is now unused.  Well spoltted.

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PR Comment: https://git.openjdk.org/jdk/pull/27295#issuecomment-3292499021