`get_effects()` should pull from optimized cache if `optimize == true`

[staticfloat]

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Without this, a custom interpreter that has better effects analysis after optimization is unable to surface its effects information to Cthulhu.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (2c33b9a) to head (62d458a). Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/reflection.jl	0.00%	1 Missing :warning:

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #475   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           9       9           
  Lines        1556    1574   +18     
======================================
- Misses       1556    1574   +18     

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