Codegen: Add a pass that converts big integers into floats.
This allows us to use Taylor expansions for the Laplace FMM with order 9 and above. Without this, loopy will complain that it can't infer the type of large ints.
This allows us to use Taylor expansions for the Laplace FMM with order 9 and above. Without this, loopy will complain that it can't infer the type of large ints.