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988137c040
Make MIR cleanup for functions with impossible predicates into a real MIR pass It's a bit jarring to see the body of a function with an impossible-to-satisfy where clause suddenly go to a single `unreachable` terminator when looking at the MIR dump output in order, and I discovered it's because we manually replace the body outside of a MIR pass. Let's make it into a fully flegded MIR pass so it's more clear what it's doing and when it's being applied.