Apply passes multiple times

[bjorn3]

Clearing a function body for example may make other functions dead code.

[jethrogb]

I would but I don't know when to stop. I'm not sure it's guaranteed that we won't see a bistable convergence, especially as more passes are added in the future.

[bjorn3]

Maybe require that output of the latest pass has strictly less bytes/tokens than the output of the previous pass? That would guarantee that it stops, as eventually you are left with an empty file if every pass keeps shrinking the input.