[llvm-dev] Where does doInitialization() fit into the new PassManager model?

[Zhang via llvm-dev]

Hi:
In my legacy pass, I usually use doInitialization() to call Module::createRNG() to create a RandomNumberGenerator, which my FunctionPass later uses.
How does this model fit into the new PassManager interface? Creating my new pass as run(Function&F ....) and re-create my RNG each time doesn't preserve its internal state, but using run(Module& M) seems a bit overkill to me?
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