[llvm] [CFG] Avoid introducing complex phi when removing empty blocks (PR #104887)

[Nikita Popov via llvm-commits]

================
@@ -1040,6 +1045,42 @@ CanRedirectPredsOfEmptyBBToSucc(BasicBlock *BB, BasicBlock *Succ,
   return true;
 }
 
+// Check whether removing BB will make the phis in its Succ will have too
----------------
nikic wrote:

```suggestion
// Check whether removing BB will make the phis in its Succ have too
```

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