[DAG] computeKnownFPClass - add ISD::MAXNUM/MINNUM handling + test coverage
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llvm:SelectionDAG
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Description
ISD::FMAXIMUM/ISD::FMINIMUM + ISD::FMAXIMUMNUM/ISD::FMINIMUMNUM handling can be added as well
This will need to be based off the implementation in computeKnownFPClass in ValueTracking.cpp - DenormalMode access might take some additional patches / test coverage
This should be tested with IR tests and not unit tests
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