Investigate Csmith for fuzzing xlscc

I wonder if [Csmith](https://embed.cs.utah.edu/csmith/) would be useful for generating random input programs for fuzzing xlscc. It might need to be augmented with a wrapper which does I/O and feeds Csmith-generated functions. Not sure if Csmith would be able to generate ac_int types, however it probably would be good at stress testing other parts of xlscc such as control flow handling.