Function compute_fifo_sides 

pub fn compute_fifo_sides(shell: &str) -> Vec<(String, char)>

The sides of the shell’s dual-clock FIFOs that step at the compute clock’s step, from the shell’s text: each FIFO instance’s name and its side, 'w' its writes’ and 'r' its reads’, clocked by the user clock under the compute side’s enable (cce, a channel’s uce). Every other side runs on its own clock or every user cycle.