compiler: Fix dtype of FFP and edit sympy_dtype

[ZoeLeibowitz]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.50%. Comparing base (71e7eda) to head (edea3b7).

:exclamation: There is a different number of reports uploaded between BASE (71e7eda) and HEAD (edea3b7). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (71e7eda)	HEAD (edea3b7)
	16	6

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2513      +/-   ##
==========================================
- Coverage   87.28%   78.50%   -8.79%     
==========================================
  Files         238      238              
  Lines       45703    45712       +9     
  Branches     4057     4058       +1     
==========================================
- Hits        39892    35885    -4007     
- Misses       5126     9078    +3952     
- Partials      685      749      +64     

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