RFR: 8364936: Shenandoah: Switch nmethod entry barriers to conc_instruction_and_data_patch

[William Kemper]

On Wed, 10 Sep 2025 19:07:08 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!

Marked as reviewed by wkemper (Committer).

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PR Review: https://git.openjdk.org/shenandoah-jdk21u/pull/218#pullrequestreview-3264724126