Fix regarding memory overwrite during sha3 computation.
Fix regarding memory overwrite during sha3 computation.

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