This directory contains the files for the compiler backend.  All of these
 phases operate on FLIC code.
 
 optimize -- performs various tweaks to compact the code and make it faster.
   also includes a postpass to fill in some additional structure slots.
 
 strictness -- attaches strictness information to functions and decides
   whether locally-bound variables have a boxed or unboxed representation.
 
 codegen -- generates Lisp code from the optimized FLIC code.