[llvm] [AMDGPU] Add legalizer rule support for AMDGPU's regbank fminimumnum and fmaximumnum (PR #192719)

[Jasmine Tang via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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badumbatish wrote:

i'm unsure. I was adding this following #179817 but to be honest I'm not too sure about the purpose of said test

https://github.com/llvm/llvm-project/pull/192719