[llvm] NFC: Add a comment indicating UpdateAnalysisInformation invalidates DFS Numbering (PR #91252)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: AdityaK (hiraditya)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/91252.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Utils/BasicBlockUtils.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index 51fc28ef90ef6b..a57e7b03b5128b 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -1145,6 +1145,7 @@ BasicBlock *llvm::splitBlockBefore(BasicBlock *Old, BasicBlock::iterator SplitPt
 }
 
 /// Update DominatorTree, LoopInfo, and LCCSA analysis information.
+/// Invalidates DFS Numbering when DTU or DT is provided.
 static void UpdateAnalysisInformation(BasicBlock *OldBB, BasicBlock *NewBB,
                                       ArrayRef<BasicBlock *> Preds,
                                       DomTreeUpdater *DTU, DominatorTree *DT,

``````````

</details>


https://github.com/llvm/llvm-project/pull/91252