refactor(g115): improve coverage, xor and left shift support

[oittaa]

Probably pretty niche cases, but they should work now.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 84.01361% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.97%. Comparing base (1216c9b) to head (476c43e).
⚠️ Report is 159 commits behind head on master.

Files with missing lines	Patch %	Lines
analyzers/conversion_overflow.go	83.68%	35 Missing and 12 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1462      +/-   ##
==========================================
- Coverage   68.49%   67.97%   -0.53%     
==========================================
  Files          75       79       +4     
  Lines        4384     5745    +1361     
==========================================
+ Hits         3003     3905     +902     
- Misses       1233     1643     +410     
- Partials      148      197      +49     

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