[llvm] expandFMINIMUMNUM_FMAXIMUMNUM: Improve compare between zeros (PR #140193)

[Matt Arsenault via llvm-commits]

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@@ -8852,6 +8852,7 @@ SDValue TargetLowering::expandFMINIMUMNUM_FMAXIMUMNUM(SDNode *Node,
     RHS = DAG.getSelectCC(DL, RHS, RHS, LHS, RHS, ISD::SETUO);
   }
 
+  // Please always prefer RHS if equal.
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arsenm wrote:

```suggestion
  // Always prefer RHS if equal.
```

https://github.com/llvm/llvm-project/pull/140193