Native u256

[nanne007]

related starcoinorg/diem#211

[codecov]

Codecov Report

Merging #3032 (d1a332a) into master (26d9af0) will increase coverage by 0.17%.
The diff coverage is 13.47%.

@@            Coverage Diff             @@
##           master    #3032      +/-   ##
==========================================
+ Coverage   33.14%   33.30%   +0.17%     
==========================================
  Files         516      516              
  Lines       45976    46020      +44     
  Branches    20965    21019      +54     
==========================================
+ Hits        15233    15324      +91     
+ Misses      16425    16337      -88     
- Partials    14318    14359      +41     

Flag	Coverage Δ
unittests	33.30% <13.47%> (+0.17%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
vm/move-cli/src/package.rs	0.00% <ø> (ø)
vm/natives/src/u256.rs	0.00% <0.00%> (ø)
vm/natives/src/lib.rs	81.82% <87.50%> (+31.82%)	⬆️
executor/src/block_executor.rs	35.56% <0.00%> (-11.11%)	⬇️
executor/src/executor.rs	50.00% <0.00%> (-4.16%)	⬇️
vm/types/src/on_chain_config/mod.rs	50.69% <0.00%> (-4.10%)	⬇️
consensus/src/difficulty.rs	39.54% <0.00%> (-3.48%)	⬇️
...mmons/accumulator/src/inmemory/accumulator_test.rs	46.76% <0.00%> (-2.59%)	⬇️
txpool/src/pool.rs	58.34% <0.00%> (-2.38%)	⬇️
vm/types/src/token/token_code.rs	33.34% <0.00%> (-2.38%)	⬇️
... and 72 more

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[jolestar]

这个 patch 还需要么？