RFR: 8346475: RISC-V: Small improvement for MacroAssembler::ctzc_bit [v3]

[Fei Yang]

On Wed, 18 Dec 2024 15:03:32 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Fei Yang has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Review comments
>>  - Review comments
>
> Looks good, thanks for updating!

@Hamlin-Li @feilongjiang : Thanks for the review! Tier1-2 test is still clean with the latest version. Moving on.

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PR Comment: https://git.openjdk.org/jdk/pull/22800#issuecomment-2552589508