[llvm] [SimplifyCFG] Supporting hoisting/sinking callbases with differing attrs (PR #109472)

[Yingwei Zheng via llvm-commits]

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@@ -1591,10 +1591,149 @@ static void hoistLockstepIdenticalDbgVariableRecords(
   }
 }
 
+// See if we can intersect the attributes for two callbases (used for sinking).
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dtcxzyw wrote:

```suggestion
/// See if we can intersect the attributes for two callbases (used for hoisting/sinking).
```

https://github.com/llvm/llvm-project/pull/109472