[llvm] RISC-V: Add fminimumnum and fmaximumnum support (PR #104411)

[Craig Topper via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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topperc wrote:

Can you add these tests to the files we already test llvm.maxnum/minnum in like `float-intrinsics.ll? 

https://github.com/llvm/llvm-project/pull/104411