================
@@ -5665,9 +5705,9 @@ mlir::LogicalResult 
CIRToLLVMIndirectBrOpLowering::matchAndRewrite(
   // If the poison attribute is set, use llvm.mlir.poison as the address.
   // This happens when the block has no predecessors and is essentially
   // unreachable. Do NOT erase the block argument directly, as that violates
-  // the MLIR dialect conversion framework contract (the framework tracks block
-  // arguments and will clean them up). A block with no predecessors simply
-  // produces no PHI node.
+  // the MLIR dialect conversion framework contract (the framework tracks
----------------
erichkeane wrote:

unrelated change?

https://github.com/llvm/llvm-project/pull/224851
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