Modularize JIT #86
Description
Currently, src/utils/generate_cxx_code.cpp has a lot going on. We need to break it down and modularize it.
First, create a JIT structure that encapsulate all the maps, sets, vectors, and list that are passed to static functions.
Second, make the functions that populates those data structure as the member methods of the JIT structure.
Thirst, separate the routines that populates data structure from IO routines. i.e., wrap them into separate functions.
Fourth, revisit the variable name choices.
This will make the code more readable and versatile.