[llvm-dev] What's the go-to method to call other transform passes in LLVM9?

[Zhang via llvm-dev]

Hi:
In my in-house transform passes I needs to properly lower Switch/Invoke and PhiNodes, prior to LLVM9 I just call createLowerSwitchPass() and run it. However in LLVM9 doing this would assert out with error message:   


Assertion failed: (Resolver && "Pass has not been inserted into a PassManager object!"), function getAnalysis, file \LLVM9/llvm/include/llvm/PassAnalysisSupport.h, line 221.


Is there any suggestion on this? And how do I make sure my transform passes in PassManagerBuilder are executed in a given order? Previously I create a dummy pass that calls the actual transform passes and run them in order, then inject this dummy pass into PMB
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