Idiv lzc opt

[kaamakshee]

This PR contains -

• Working code for unsigned division with lzc optimization. Both bits_per_iter=1 and bits_per_iter=2 cases are addressed.

• Updated Makefile flow:

  1. The expected output files were static and we had to change the c file each time to get a new file
  2. Automated it to just give defines (WIDTH, ITERS) as inputs to the make command
  3. Eg) After running simulation, run make test , followed by make verify
  4. make test generated new expected output files

New design doc with notes - https://docs.google.com/presentation/d/1jtqCfIULkc9yHW3kGDidr9mmkZZK64JpkwFONPGzuxM/edit#slide=id.g21dc5dfbb2f_0_521

[taylor-bsg]

Do we have a modified schematic for the changes?

I think the support for these changes should be based on an input parameter, so the user can select whether they want to pay the area overhead

[kaamakshee]

Looks great; just need to fix up for 2b at a time

Changes made for 2b case. Cleaning up code now. Also, the testing flow is static. Working on making it easier by making makefile updates.