RFR: 8360679: Shenandoah: AOT saved adapter calls into broken GC barrier stub

[Aleksey Shipilev]

On Wed, 23 Jul 2025 18:43:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for more analysis. This is AOT-, AArch64-, Shenandoah-specific problem. The fix is simple, the failure is catastrophic, and it is very reproducible. So it makes the issue P2, and would like to get it into JDK 25 under RDP 2 rules.
> 
> Additional testing:
>  - [x] Linux AArch64 server fastdebug, mainline, `runtime/cds` with `-XX:+UseShenandoahGC` (now passes)
>  - [x] Linux AArch64 server fastdebug, mainline, `hotspot_gc_shenandoah` (still passes)
>  - [x] Linux AArch64 server fastdebug, JDK 25, `runtime/cds` with `-XX:+UseShenandoahGC` (now passes)
>  - [x] Linux AArch64 server fastdebug, JDK 25, `hotspot_gc_shenandoah` (still passes)

Thank you all! Here goes the mainline integration.

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PR Comment: https://git.openjdk.org/jdk/pull/26449#issuecomment-3113995634