RFR: 8368289: [leyden] Expose AOTCodeEntry::_for_preload in VMStructs

[Aleksey Shipilev]

On Mon, 22 Sep 2025 13:31:31 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Similar to [JDK-8366811](https://bugs.openjdk.org/browse/JDK-8366811), we also need this bit to disambiguate A4 and AP4 frames in async-profiler.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `runtime/cds`
>  - [x] Ad-hoc async-profiler hacks to access this field

TestAliasingFuzzer failure again, this is unrelated to this PR, so I am integrating.

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PR Comment: https://git.openjdk.org/leyden/pull/98#issuecomment-3319908730