[llvm] [RISCV] Support vectorizing FMINIMUMNUM and FMAXIMUMNUM (PR #135727)

[Pengcheng Wang via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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wangpc-pp wrote:

It seems the test coverage is not enough compared to llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fmaximum.ll. I think you can rework these tests in this PR by copying these test files for maximum/minimum and changing the intrinsics.

https://github.com/llvm/llvm-project/pull/135727