RFR: 8346787: Fix two C2 IR matching tests for RISC-V [v2]

[Fei Yang]

On Mon, 6 Jan 2025 11:51:57 GMT, Damon Fenacci <dfenacci at openjdk.org> wrote:

>> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Comment
>
> Marked as reviewed by dfenacci (Committer).

@dafedafe @feilongjiang : Thanks for the review!

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PR Comment: https://git.openjdk.org/jdk/pull/22874#issuecomment-2574185274