Fix for the slow but constant increase in memory usage

[NathanKolbow]

The garbage collector does not get called by default in the snaq optimization loop, so memory slowly grows out of control for long optimizations.

Memory usage graph before this change:

Memory usage graph after this change:

[cecileane]

thanks for this work! This change looks good to me.

[crsl4]

Looks good to me too!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f46226c) 86.79% compared to head (b84ac74) 86.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   86.79%   86.84%   +0.05%     
==========================================
  Files          31       31              
  Lines       12635    12638       +3     
==========================================
+ Hits        10966    10975       +9     
+ Misses       1669     1663       -6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.