precompiles: Optimize EC point multiplication

[chfast]

Simplify and optimize the procedure for EC point multiplication. This reduced EC point multiplication time by 30%.

Comparing o/ec to o/ec-mulopt
Benchmark                                                                  Time             CPU      Time Old      Time New       CPU Old       CPU New
-------------------------------------------------------------------------------------------------------------------------------------------------------
precompile<PrecompileId::ecrecover, evmmax_cpp>_mean                    -0.2961         -0.2960        312197        219765        312126        219741
precompile<PrecompileId::ecmul, evmmax_cpp>_mean                        -0.3179         -0.3180        144903         98842        144882         98814

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.48%. Comparing base (07f1fd7) to head (72ef246).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1166       +/-   ##
===========================================
+ Coverage   31.23%   94.48%   +63.25%     
===========================================
  Files         169      169               
  Lines       18020    18014        -6     
===========================================
+ Hits         5628    17021    +11393     
+ Misses      12392      993    -11399     

Flag	Coverage Δ
eof_execution_spec_tests	20.89% <0.00%> (+<0.01%)	⬆️
ethereum_tests	27.07% <100.00%> (-0.03%)	⬇️
ethereum_tests_silkpre	19.53% <100.00%> (-0.03%)	⬇️
execution_spec_tests	21.25% <0.00%> (+<0.01%)	⬆️
unittests	91.66% <100.00%> (?)

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Files with missing lines	Coverage Δ
lib/evmone_precompiles/ecc.hpp	100.00% <100.00%> (ø)

... and 112 files with indirect coverage changes

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