[jdk25u] RFR: 8367066: RISC-V: refine register selection in MacroAssembler:: decode_klass_not_null

[duke]

On Fri, 12 Sep 2025 02:05:11 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [0b3a3030](https://github.com/openjdk/jdk/commit/0b3a303053d0eb5a98ed3d9df42c659db148b470) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Hamlin Li on 11 Sep 2025 and was reviewed by Fei Yang and Feilong Jiang.
> 
> Thanks!

@DingliZhang 
Your change (at version 01b22e5a9698c48a9983e849cb270489a806b17d) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk25u/pull/185#issuecomment-3285589657