[llvm] InstCombine: Handle minnum/maxnum in SimplifyDemandedFPClass (PR #179299)

[Yingwei Zheng via llvm-commits]

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@@ -2212,8 +2212,10 @@ simplifyDemandedFPClassMinMax(KnownFPClass &Known, Intrinsic::ID IID,
 
     break;
   }
+  case Intrinsic::maxnum:
   case Intrinsic::maximumnum: {
-    OpKind = KnownFPClass::MinMaxKind::maximumnum;
+    OpKind = IID == Intrinsic::maxnum ? KnownFPClass::MinMaxKind::maxnum
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dtcxzyw wrote:

It should be easier to read if we calculate `OpKind = getMinMaxKind(IID)` before the switch.

https://github.com/llvm/llvm-project/pull/179299