message: Do not leak dex NOPs
  Summary: As title.
diff: @@ -438,6 +438,7 @@ void balloon(DexMethod* method, IRList* ir_list) {
  std::unordered_map<MethodItemEntry*, DexOpcodeData*> entry_to_data;
  uint32_t addr = 0;
  + std::vector<std::unique_ptr<DexInstruction>> to_delete;
  for (auto insn : *instructions) {
  MethodItemEntry* mei;
  if (insn->opcode() == DOPCODE_NOP ||
  @@ -448,6 +449,8 @@ void balloon(DexMethod* method, IRList* ir_list) {
  mei = new MethodItemEntry();
  if (dex_opcode::is_fopcode(insn->opcode())) {
  entry_to_data.emplace(mei, static_cast<DexOpcodeData*>(insn));
  + } else {
  + to_delete.emplace_back(insn);
  }
  } else {
  mei = new MethodItemEntry(insn);
  