[llvm] [BranchFolding] Use isSuccessor to confirm fall through (PR #77923)

[Phoebe Wang via llvm-commits]

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@@ -49,3 +49,44 @@ body:             |
   bb.6:
     RET 0
 ...
+---
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phoebewang wrote:

Pre-commit the test case?

https://github.com/llvm/llvm-project/pull/77923