[jdk25u] RFR: 8343218: Add option to disable allocating interface and abstract classes in non-class metaspace

[Coleen Phillimore]

On Thu, 21 Aug 2025 12:32:05 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is a clean backport of the addition of a diagnostic option to turn off the optimization of storing interface and abstract classes in non-class metaspace in case some customer hits some c2 bug.  We may also decide to backport to JDK 25 removing this optimization completely.

GHA pass, clean backport.

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PR Comment: https://git.openjdk.org/jdk25u/pull/123#issuecomment-3211363416