TamperWith.cs

private void TamperWith(
  MethodDefinition method, 
  IEnumerable<Instruction> calls)
{
  foreach (var call in calls)
  {
    var il = method.Body.GetILProcessor();
    int counter = method.Parameters.Count;
    while (counter > 0)
    {
      var starg = il.Create(OpCodes.Starg, --counter);
      il.InsertBefore(call, starg);
    }
    var start = method.Body.Instructions[0];
    var loop = il.Create(OpCodes.Br_S, start);
    il.InsertBefore(call, loop);
    il.Remove(call.Next); // Ret
    il.Remove(call);
  }
}