[jdk25u] RFR: 8367692: RISC-V: Align post call nop

[Robbin Ehn]

On Wed, 8 Oct 2025 12:32:03 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [07ecc93d](https://github.com/openjdk/jdk/commit/07ecc93dbd0b74e2362d369e22b5141289eb1f76) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Robbin Ehn on 30 Sep 2025 and was reviewed by Fei Yang, Feilong Jiang and Hamlin Li.
> 
> Not clean!
> 
> Thanks!

@RealFYang

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PR Comment: https://git.openjdk.org/jdk25u/pull/281#issuecomment-3381529592