[llvm] [SimplifyCFG] Avoid increasing too many phi entries when removing empty blocks (PR #104887)

[Yingwei Zheng via llvm-commits]

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@@ -1047,6 +1053,34 @@ CanRedirectPredsOfEmptyBBToSucc(BasicBlock *BB, BasicBlock *Succ,
   return true;
 }
 
+// Check whether removing BB will make the phis in its Succ have too
+// many incoming entries. This function does not check whether BB is foldable
+// or not.
----------------
dtcxzyw wrote:

```suggestion
/// Check whether removing \p BB will make the phis in its \p Succ have too
/// many incoming entries. This function does not check whether \p BB is foldable
/// or not.
```

https://github.com/llvm/llvm-project/pull/104887