Improve evaluate function

[sunxd3]

• Refactor evaluate function for speed and clarity
• simplify functions in BUGSPrimitives that have implementations from Stdlib

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 80.85%. Comparing base (4510c17) to head (46e2355).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/compiler_pass.jl	92.85%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
+ Coverage   79.62%   80.85%   +1.23%     
==========================================
  Files          21       21              
  Lines        1978     1959      -19     
==========================================
+ Hits         1575     1584       +9     
+ Misses        403      375      -28     

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