Add more contracts to benchmarking suite

[chfast]

• [ ] Add README with links to contracts source code
• [ ] https://blog.ricmoo.com/verifying-messages-in-solidity-50a94f82b2ca
• [ ] https://github.com/javgh/ed25519-solidity
• [ ] https://github.com/karalabe/snailtracer

[axic]

Upated snailtracer to Solidity 0.5.x: https://github.com/axic/snailtracer

You could also try https://github.com/axic/blake2-solidity with supporting the precompile. It has test case.s

[chfast]

Upated snailtracer to Solidity 0.5.x: https://github.com/axic/snailtracer

Do you have some example inputs? This one is also using a lot of divisions, so not ideal for benchmarks...

You could also try https://github.com/axic/blake2-solidity with supporting the precompile. It has test case.s

Do you have the native code for the precompile?

[chfast]

Closed because all of the mentioned codes use precompiles (except snailtracer https://github.com/ipsilon/evm-benchmarks/issues/8). If you think we should reconsider any of these, create issue in https://github.com/ipsilon/evm-benchmarks.