Improve compilesim.py test coverage

[gaborszita]

I added more tests to improve the test coverage of compilesim.py:

• Added tests test_less_than_cmp_simulation and test_equals_simulation to cover functions _build_eq and _build_cmp in compilesim.py
• Added tests to test RomBlocks with more bit widths to cover the function _romwidth in compilesim.py
• Added test test_rom_romblock_in_memory_value_map_error to test the exception raise PyrtlError('RomBlock in memory_value_map') (line 781 in compilesim.py)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.7%. Comparing base (7dfa485) to head (9c2b493).

Additional details and impacted files

@@              Coverage Diff              @@
##           development    #458     +/-   ##
=============================================
+ Coverage         91.4%   91.7%   +0.4%     
=============================================
  Files               24      24             
  Lines             6413    6413             
=============================================
+ Hits              5858    5878     +20     
+ Misses             555     535     -20     

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[fdxmw]

Thank you for the pull request, looks good overall! I have some minor style comments, and there are a couple pycodestyle errors in the presubmit checks too:

  tests/test_compilesim.py:948:1: W293 blank line contains whitespace
  tests/test_compilesim.py:951:1: W293 blank line contains whitespace

[gaborszita]

@fdxmw fixed