Removed statements with side effects from asserts

[antoninbas]

In release builds, it is common to define NDEBUG to ignore
asserts. Which means it is a bad idea to call methods with necessary
side-effects inside asserts...

[codecov-io]

Codecov Report

Merging #402 into master will decrease coverage by 0.06%.
The diff coverage is 37.14%.

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
- Coverage   76.55%   76.49%   -0.07%     
==========================================
  Files         114      115       +1     
  Lines        8977     8992      +15     
==========================================
+ Hits         6872     6878       +6     
- Misses       2105     2114       +9

Impacted Files	Coverage Δ
src/bm_sim/match_tables.cpp	77.45% <ø> (ø)	⬆️
include/bm/bm_sim/nn.h	63.26% <ø> (ø)	⬆️
src/bm_sim/dev_mgr_bmi.cpp	0% <0%> (ø)	⬆️
include/bm/bm_sim/actions.h	31.42% <0%> (ø)	⬆️
src/bm_sim/match_units.cpp	90.21% <0%> (-0.18%)	⬇️
src/bm_sim/debugger.cpp	2% <0%> (+0.01%)	⬆️
src/bm_sim/_assert.cpp	0% <0%> (ø)
src/bm_sim/parser_error.cpp	97.61% <100%> (ø)	⬆️
src/bm_sim/simple_pre.cpp	59.09% <100%> (+0.47%)	⬆️
src/bm_sim/lookup_structures.cpp	100% <100%> (ø)	⬆️
... and 3 more

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