[llvm] [InstCombine] Optimize redundant floating point comparisons in `or` inst (PR #158097)

[Hongyu Chen via llvm-commits]

================
@@ -1850,6 +1850,26 @@ static Value *simplifyAndOrOfFCmps(const SimplifyQuery &Q, FCmpInst *LHS,
                  : ConstantInt::getBool(LHS->getType(), !IsAnd);
   }
 
+  Value *V0;
+  const APFloat *V0Op1, *V1Op1;
----------------
XChy wrote:

```suggestion
  const APFloat *V0Op1, *V1Op1;
  // V0 < C1 || V0 < C2 -> V0 < max(C1, C2)
  // V0 > C1 || V0 > C2 -> V0 > min(C1, C2)
```

https://github.com/llvm/llvm-project/pull/158097