RFR: 8349632: RISC-V: Add Zfa fminm/fmaxm [v3]

[Anjian Wen]

> 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:

  add temp commit for test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23509/files
  - new: https://git.openjdk.org/jdk/pull/23509/files/927d0244..faa90708

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23509&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23509&range=01-02

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23509.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23509/head:pull/23509

PR: https://git.openjdk.org/jdk/pull/23509