[jdk25u] RFR: 8364120: RISC-V: unify the usage of MacroAssembler::instruction_size

[duke]

On Sun, 10 Aug 2025 03:21:39 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [7bf4c608](https://github.com/openjdk/jdk/commit/7bf4c608e7b23398ea89cf0a592e9554af98144e) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Hamlin Li on 28 Jul 2025 and was reviewed by Fei Yang.
> 
> Thanks!

@DingliZhang 
Your change (at version 3b68bee9c4bd8db29f30270284bc7d8fdaab87ce) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk25u/pull/81#issuecomment-3181867781