src/beacon_root: gas optimization #21
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This PR is a small gas optimization for the beacon_root-contract.
stopat the end of the contract: the execution stops, if the end of the contract is reached. an explicitstopat the end is not required.iszero:jumpijumps, if the condition is non-zero. thus, theinput_timestampcan be used as the condition directly. This reduces the gas consumption of the execution with valid input data by 2 (-3 for dropping theiszero, +1 for an extrajumpdest)