RFR: 8367692: RISC-V: Align post call nop [v5]

[Fei Yang]

On Thu, 25 Sep 2025 12:44:01 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Hi please, consider.
>> 
>> As ziccif require instructions to natural aligned to be atomic the 4 byte post call nop must be aligned.
>> But I don't want to add a c.nop(2b) to align the nop(4b) which means the jal(r) must also be algined.
>> As we have no utility to aligned the end of an instruction sequence the call it self is aligned and uses only 4 byte instructions. Only in the case where we could use an two c-instruction we may loose space.
>> 
>> Thanks, Robbin
>
> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use relocation spec as marker.

Latest version looks good. Thanks for the update.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27467#pullrequestreview-3267892811