[llvm] [InstCombine] `A == MIN_INT ? B != MIN_INT : A < B` to `A < B` (PR #120177)

[Yingwei Zheng via llvm-commits]

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@@ -1795,6 +1843,10 @@ static Instruction *foldSelectICmpEq(SelectInst &SI, ICmpInst *ICI,
   if (Pred == ICmpInst::ICMP_NE)
     std::swap(TrueVal, FalseVal);
 
+  if (Value *V = foldSelectWithExtremeEqCond(CmpLHS, CmpRHS, TrueVal, FalseVal,
+                                             IC.Builder))
+    return IC.replaceInstUsesWith(SI, V);
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dtcxzyw wrote:

```suggestion
    return Res;
```

https://github.com/llvm/llvm-project/pull/120177