[llvm-branch-commits] [llvm] [KeyInstr][SimplifyCFG] Remap atoms when folding br to common succ into pred (PR #133482)

[Stephen Tozer via llvm-branch-commits]

================
@@ -1182,6 +1187,19 @@ static void cloneInstructionsIntoPredecessorBlockAndUpdateSSAUses(
       U.set(NewBonusInst);
     }
   }
+
+  // Key Instructions: We may have propagated atom info into the pred. If the
+  // pred's terminator already has atom info do nothing as merging would drop
+  // one atom group anyway. If it doesn't, propagte the remapped atom group
----------------
SLTozer wrote:

```suggestion
  // one atom group anyway. If it doesn't, propagate the remapped atom group
```

https://github.com/llvm/llvm-project/pull/133482