[llvm] [LowerSwitch] Don't let pass manager handle the dependency (PR #68662)

[Arthur Eubanks via llvm-commits]

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@@ -702,6 +702,8 @@ BasicBlock *CreateControlFlowHub(
 // successors
 void InvertBranch(BranchInst *PBI, IRBuilderBase &Builder);
 
+// Check whether the block only has simple terminator: br/brcond/unreachable/ret
+bool hasOnlySimpleTerminator(const BasicBlock *BB);
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aeubanks wrote:

if all users are checking all blocks, we should just make this API do that, instead of check a single block

https://github.com/llvm/llvm-project/pull/68662