code: function preprocessValidJumps (runState) {
    for (var i = 0; i < runState.code.length; i++) {
      var curOpCode = lookupOpInfo(runState.code[i]).name
  
      // no destinations into the middle of PUSH
      if (curOpCode === 'PUSH') {
        i += runState.code[i] - 0x5f
      }
  
      if (curOpCode === 'JUMPDEST') {
        runState.validJumps.push(i)
      }
    }
  }
docs: find all the valid jumps and puts them in the `validJumps` array