Fix incorrect IR for expression with two ternary operators

[IlyaMuravjov]

Fixes #219

Doesn't pass UnusedVariableTest, which seems to be less bad when compared to producing incorrect IR

[codecov[bot]]

Codecov Report

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

Project coverage is 59.80%. Comparing base (2dc8efe) to head (dc2a778).

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #220      +/-   ##
============================================
- Coverage     59.91%   59.80%   -0.12%     
+ Complexity     2417     2416       -1     
============================================
  Files           294      294              
  Lines         18469    18469              
  Branches       3306     3306              
============================================
- Hits          11066    11045      -21     
- Misses         6328     6346      +18     
- Partials       1075     1078       +3     

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