RFR: 8349632: RISC-V: Add Zfa fminm/fmaxm

[Anjian Wen]

On Fri, 7 Feb 2025 06:52:13 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

> Hi @Anjian-Wen, welcome to this OpenJDK project and thanks for contributing!
> 
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PR Comment: https://git.openjdk.org/jdk/pull/23509#issuecomment-2664522249