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

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``````````bash
git-clang-format --diff 2f808dd0702ba3c364eb4373714a1fb09078909d 1563edcf81023e6d370df48ae1cf44ecfb1761f0 --extensions cpp -- llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp llvm/unittests/Transforms/Utils/BasicBlockUtilsTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp b/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
index 075a1afb4f..c22d038853 100644
--- a/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
+++ b/llvm/lib/Transforms/Utils/BreakCriticalEdges.cpp
@@ -205,7 +205,7 @@ llvm::SplitKnownCriticalEdge(Instruction *TI, unsigned SuccNum,
     }
   }
 
-  unsigned NumSplittedIdenticalEdges = 1; 
+  unsigned NumSplittedIdenticalEdges = 1;
 
   // If there are any other edges from TIBB to DestBB, update those to go
   // through the split block, making those edges non-critical as well (and
@@ -293,11 +293,11 @@ llvm::SplitKnownCriticalEdge(Instruction *TI, unsigned SuccNum,
 
         // Update LCSSA form in the newly created exit block.
         if (Options.PreserveLCSSA) {
-          // If > 1 identical edges to be splitted, we need to introduce 
+          // If > 1 identical edges to be splitted, we need to introduce
           // the incoming blocks of the same number for the new PHINode.
           createPHIsForSplitLoopExit(
-            SmallVector<BasicBlock *, 4>(NumSplittedIdenticalEdges, TIBB),
-            NewBB, DestBB);
+              SmallVector<BasicBlock *, 4>(NumSplittedIdenticalEdges, TIBB),
+              NewBB, DestBB);
         }
 
         if (!LoopPreds.empty()) {

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