Do not pad code for EOF

[chfast]

EOF does not require code padding for execution as executable code must end with terminating instruction.
This also refactors code analysis and execution state.

[codecov]

Codecov Report

Merging #508 (53305d4) into master (9f4eef7) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
- Coverage   99.41%   99.41%   -0.01%     
==========================================
  Files          53       54       +1     
  Lines        5264     5258       -6     
==========================================
- Hits         5233     5227       -6     
  Misses         31       31              

Flag	Coverage Δ
blockchaintests	77.78% <56.52%> (-0.08%)	⬇️
statetests	7.58% <0.00%> (+0.01%)	⬆️
unittests	99.55% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
lib/evmone/execution_state.hpp	94.54% <ø> (-0.20%)	⬇️
test/unittests/execution_state_test.cpp	100.00% <ø> (ø)
lib/evmone/baseline.cpp	100.00% <100.00%> (ø)
lib/evmone/baseline.hpp	100.00% <100.00%> (ø)
lib/evmone/instructions.hpp	100.00% <100.00%> (ø)