RFR: 8364936: Shenandoah: Switch nmethod entry barriers to conc_instruction_and_data_patch [v3]

[duke]

On Thu, 25 Sep 2025 17:48:36 GMT, Cesar Soares Lucas <cslucas at openjdk.org> wrote:

>> Hi all,
>> 
>> This pull request contains a backport of commit [81a1e8e1](https://github.com/openjdk/jdk/commit/81a1e8e1363446de499a59fc706221efde12dd86) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
>> 
>> The commit being backported was authored by Cesar Soares Lucas on 8 Sep 2025 and was reviewed by Fei Yang, Dingli Zhang, Kelvin Nilsen and William Kemper.
>> 
>> I had to manually resolve a merge conflict in `TestHotSpotVMConfig.java` because the original patch modified a region of the file that is not present in this repository version of the same file.
>> 
>> Thanks!
>
> Cesar Soares Lucas has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   Revert some changes due to non-ZGC using the old patching type.

@JohnTortugo 
Your change (at version 0020610c8bd430ab8b1e4fe13a3d1e4875e702c7) is now ready to be sponsored by a Committer.

-------------

PR Comment: https://git.openjdk.org/shenandoah-jdk21u/pull/218#issuecomment-3340289073