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

[Fei Yang]

On Wed, 8 Oct 2025 07:29:30 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Same issue exist in jdk25u repo as well. (Attention @robehn)
>> Backport is not clean as we don't have fix for https://bugs.openjdk.org/browse/JDK-8358821 in this repo.
>> So I have to keep `NativeIllegalInstruction::insert` as it is still used in this repo. This is removed in the original patch.
>> 
>> Testing: Run full tier1-tier3 tests with fastdebug build on linux-riscv64 platform.
>
> Marked as reviewed by rehn (Committer).

@robehn: Thanks for the quick reply. We still need a `Reviewer` here.

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PR Comment: https://git.openjdk.org/jdk25u/pull/280#issuecomment-3380155574