the use of `set` (which does not guarantee order of its elements)
instead of `dict` (which guarantees insertion order) led to instability
across runs of the compiler between different versions of python. this
commit patches the problem by using a derivation of `dict` to track the
call graph instead of `set`.

Codecov Report

Merging #3370 ( 81133dc ) into master ( 7c3cf61 ) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #3370      +/-   ##
==========================================
- Coverage   88.88%   88.73%   -0.15%     
==========================================
  Files          85       85
  Lines       10706    10709       +3
  Branches     2233     2233
==========================================
- Hits         9516     9503      -13     
- Misses        788      805      +17     
+ Partials      402      401       -1     

... and 2 files with indirect coverage changes

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