Refactor CollectVariables

[sunxd3]

• Refactor the analyze_assignment function of CollectVariables
• Added some tests for the functions
• Speed is improved a little bit on some examples

[coveralls]

Pull Request Test Coverage Report for Build 8191161964

Details

• 23 of 24 (95.83%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.9%) to 81.785%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/compiler_pass.jl	23	24	95.83%

Totals
Change from base Build 8189132467:	0.9%
Covered Lines:	1585
Relevant Lines:	1938

---

💛 - Coveralls

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.78%. Comparing base (4b05532) to head (f632f2a).

Files	Patch %	Lines
src/compiler_pass.jl	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
+ Coverage   80.90%   81.78%   +0.87%     
==========================================
  Files          21       21              
  Lines        1943     1938       -5     
==========================================
+ Hits         1572     1585      +13     
+ Misses        371      353      -18     

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