Figure out error code in interpreter epilogue

[chfast]

This is an attempt to prove that the exact EVM error code can be figured out in the interpreter epilogue and instruction implementations do not need to produce precise value.

[codecov[bot]]

Codecov Report

Merging #421 (460dd71) into master (0c1685e) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #421   +/-   ##
=======================================
  Coverage   99.64%   99.65%           
=======================================
  Files          31       31           
  Lines        3991     4015   +24     
=======================================
+ Hits         3977     4001   +24     
  Misses         14       14           

Flag	Coverage Δ
consensus	86.69% <100.00%> (+0.18%)	:arrow_up:
unittests	99.70% <100.00%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
lib/evmone/baseline.cpp	100.00% <100.00%> (ø)