Remove GCN lower_throw_extra! pass

[jpsamaroo]

[codecov[bot]]

Codecov Report

Merging #74 into master will increase coverage by 0.62%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   66.89%   67.51%   +0.62%     
==========================================
  Files          31       31              
  Lines        1637     1604      -33     
==========================================
- Hits         1095     1083      -12     
+ Misses        542      521      -21     

Impacted Files	Coverage Δ
src/gcn.jl	82.24% <ø> (+10.81%)	:arrow_up:

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