In case your wondering...

[Iain Buclaw]

Next development goals are so weed out the rest of the functions 
in IRState as of around the commit (link: 
https://github.com/D-Programming-GDC/GDC/commit/ca497a421e8c37c240a6794e68c17225af75d9d6), 
then rename IRBase over to IRState.  During this course, some 
general refactoring will be done, such as moving functions called 
once into their callers, etc.  The idea being that code 
generation routines should not be dependent on IRState.

Along with this, will improve dt_t by replacing the TREE_LIST 
chain iteration with building up a constructor_elts vector (for 
efficiency when generating large data types).


Regards
Iain