RFR: 8356075: Support Shenandoah GC in JVMCI [v4]

[Roman Kennke]

On Mon, 5 May 2025 20:25:27 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> In order to support Shenandoah GC in Graal, some changes are required in JVMCI, namely, export Shenandoah relevant symbols.
>> 
>> Testing:
>>  - [x] extensive testing with https://github.com/oracle/graal/pull/10904
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Simplify pre-barrier runtime entry

Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/25001#issuecomment-2854170217