[llvm] [Utils] Fix incorrect LCSSA PHI nodes when splitting critical edges with MergeIdenticalEdges (PR #131744)

[Nikita Popov via llvm-commits]

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@@ -205,6 +205,8 @@ llvm::SplitKnownCriticalEdge(Instruction *TI, unsigned SuccNum,
     }
   }
 
+  unsigned NumSplittedIdenticalEdges = 1; 
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nikic wrote:

```suggestion
  unsigned NumSplitIdenticalEdges = 1; 
```

https://github.com/llvm/llvm-project/pull/131744