Fix tests on 32bit architectures

[prabhuramachandran]

Fixes #30.

[codecov]

Codecov Report

Merging #72 (11abcae) into master (bd84da4) will increase coverage by 0.12%.
The diff coverage is 73.91%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   69.83%   69.96%   +0.12%     
==========================================
  Files          20       20              
  Lines        4108     4109       +1     
  Branches      790      791       +1     
==========================================
+ Hits         2869     2875       +6     
+ Misses       1035     1031       -4     
+ Partials      204      203       -1     

Impacted Files	Coverage Δ
compyle/cuda.py	0.00% <0.00%> (ø)
compyle/types.py	80.31% <75.00%> (+3.51%)	⬆️
compyle/jit.py	77.64% <80.00%> (ø)
compyle/array.py	62.71% <100.00%> (ø)
compyle/parallel.py	77.90% <100.00%> (ø)

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