RFR: 8349632: RISC-V: Add Zfa fminm/fmaxm [v4]

[Anjian Wen]

On Wed, 12 Mar 2025 03:45:36 GMT, Anjian Wen <duke at openjdk.org> wrote:

>> Add RISCV zfa extension fminm/fmaxm
>> This two new Floating-point instructions can deal with NaN input directly, which can decrease instructions when calculate min or max
>
> Anjian Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   delete useless comment

This patch passed gtests, and also passed Related test -- test/jdk/java/lang/Math/MinMax.java in qemu with -XX:+UseZfa

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PR Comment: https://git.openjdk.org/jdk/pull/23509#issuecomment-2716933559