RFR: 8295270: RISC-V: Clean up and refactoring for assembler functions [v3]

[Fei Yang]

On Thu, 13 Oct 2022 14:52:14 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

>> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix
>
> Change looks good. Thanks.

@feilongjiang @feilongjiang : Thanks for reviewing this non-trivial change. Need a Reviewer then. @shipilev : Want to take a look? Thanks.

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PR: https://git.openjdk.org/jdk/pull/10697