[jdk25u] RFR: 8364212: Shenandoah: Rework archived objects loading

[Aleksey Shipilev]

On Tue, 16 Sep 2025 17:37:38 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Improves Shenandoah reliability with CDS/AOT. Serves as per-requisite for Generational Shenandoah fixes.
> 
> Additional testing:
>  - [x] MacOS AArch64 server fastdebug, `runtime/cds` with `-XX:+UseShenandoahGC`
>  - [x] Linux AArch64 server fastdebug, `hotspot_gc_shenandoah`
>  - [x] Linux AArch64 server fastdebug, `all` with `-XX:+UseShenandoahGC`

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk25u/pull/206#issuecomment-3305926436