Fix comparison between bytes types.
Fix comparison between bytes types.

Fixes #2087

ruchevits/solidity,shahankhatch/solidity,chriseth/solidity,ethers/solidity,vaporry/solidity,arkpar/solidity,LianaHus/solidity,ruchevits/solidity,ruchevits/solidity,chriseth/solidity-doc-test,debris/solidity,douglas-larocca/solidity,ruchevits/solidity,gluk256/solidity