I have no idea what you mean by “how any of this works”.

I didn’t bring up solving the phase ordering problem, you did.

I’m simply pointing out that if you have a compiler where you have multiple IRs or dialects of IR, and you have a pass that is written to work on IR “X”, and then at some point after that pass you translate to IR “Y”, if you want to move your pass after that point of translation, you either need to rewrite your pass so that it operates on “Y”, or you need to translate back to “X” again.