Finish instantiation runners

[ckormanyos]

Fishish instantiation runner work started in #1094 and #1095

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5b8569c) 91.86% compared to head (b0c4224) 92.61%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1096      +/-   ##
===========================================
+ Coverage    91.86%   92.61%   +0.75%     
===========================================
  Files          769      769              
  Lines        63831    63883      +52     
===========================================
+ Hits         58637    59164     +527     
+ Misses        5194     4719     -475     

Files	Coverage Δ
test/compile_test/instantiate.hpp	100.00% <100.00%> (+33.24%)	⬆️
test/test_instantiate3.cpp	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[ckormanyos]

OK. This preliminarily wraps up the topic of getting instantiations actually running (in addition to simply compiling).

I'll probably ramp down with the trouble-making for the ramainder of the road to 1.85 (unless something broken or mysterious with my recent work comes up).

If anyone is following the action on CodeCov, we now have a solid $92{\ldots}93\%$.

Cc: @jzmaddock and @mborland and @NAThompson

[ckormanyos]

See also #1068