Wasm compilation of core_test

[yperbasis]

Part of work on Issue #111

[codecov-io]

Codecov Report

Merging #129 (97c2971) into master (15f0440) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #129   +/-   ##
=======================================
  Coverage   83.60%   83.60%           
=======================================
  Files          54       54           
  Lines        5202     5202           
=======================================
  Hits         4349     4349           
  Misses        853      853           

Impacted Files	Coverage Δ
core/silkworm/common/util.hpp	70.00% <ø> (ø)
core/silkworm/common/util.cpp	97.33% <100.00%> (-0.07%)	⬇️
core/silkworm/execution/precompiled.cpp	100.00% <100.00%> (ø)

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