message: Use uint16_t for registers
  Summary:
  uint8_t -> uint16_t
  While looking at the SynthPass output, noticed that the iget instructions wasn't using the initial instruction's src(0)
diff: @@ -360,7 +360,7 @@ WrapperMethods analyze(const ClassHierarchy& ch,
  return ssms;
  }
  -IRInstruction* make_iget(DexField* field, uint8_t src) {
  +IRInstruction* make_iget(DexField* field, uint16_t src) {
  auto const opcode = [&]() {
  switch (type_to_datatype(field->get_type())) {
  case DataType::Array:
  