message: zero initialize DexInstruction::m_arg
  Summary: fix nondeterminism shown in P58283830
diff: @@ -36,11 +36,11 @@ class DexInstruction : public Gatherable {
  } m_ref_type{REF_NONE};
  private:
  - uint16_t m_opcode;
  - uint16_t m_arg[MAX_ARG_COUNT];
  + uint16_t m_opcode = OPCODE_NOP;
  + uint16_t m_arg[MAX_ARG_COUNT] = {};
  protected:
  - uint16_t m_count;
  + uint16_t m_count = 0;
  // use clone() instead
  DexInstruction(const DexInstruction&) = default;
  