[llvm] [DAG] - computeKnownFPClass - ISD::FMAXIMUM/ISD::FMINIMUM + ISD::FMAXIMUMNUM/ISD::FMINIMUMNUM (PR #190465)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

@Ko496-glitch you mentioned these tests - are they none that you can copy+convert to equivalent DAG tests?

```
llvm/test/Transforms/Attributor/nofpclass-minimumnum-maximumnum.ll
llvm/test/Transforms/Attributor/nofpclass-minimum-maximum.ll
llvm/test/Transforms/Inline/simplify-instruction-computeKnownFPClass-context.ll
llvm/test/Transforms/InstCombine/is_fpclass.ll
llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
llvm/test/Transforms/InstSimplify/floating-point-compare.ll
llvm/test/Transforms/InstSimplify/known-never-infinity.ll
```

https://github.com/llvm/llvm-project/pull/190465