improve virtual global var assignement

[aviatesk]

closes #23

[codecov-commenter]

Codecov Report

Merging #25 into master will increase coverage by 0.15%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   70.99%   71.14%   +0.15%     
==========================================
  Files          10       10              
  Lines         655      662       +7     
==========================================
+ Hits          465      471       +6     
- Misses        190      191       +1     

Flag	Coverage Δ
#unittests	71.14% <95.45%> (+0.15%)	⬆️

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Impacted Files	Coverage Δ
src/TypeProfiler.jl	100.00% <ø> (ø)
src/abstractinterpreterinterface.jl	86.36% <ø> (ø)
src/abstractinterpretation.jl	95.95% <94.44%> (+0.17%)	⬆️
src/virtualprocess.jl	93.37% <100.00%> (-0.50%)	⬇️

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