[jdk25u] RFR: 8364111: InstanceMirrorKlass iterators should handle CDS and hidden classes consistently

[Aleksey Shipilev]

On Tue, 16 Sep 2025 17:31:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Improves GC reliability with CDS and hidden classes, unblocks Shenandoah improvements that use these iterators.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `all`
>  - [x] Linux AArch64 server fastdebug, `all`
>  - [x] Linux AArch64 server fastdebug, `all` + `-XX:+UseShenandoahGC`

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk25u/pull/205#issuecomment-3345260990