message: Remove unneeded header decl of move_opcode_tuple
  Summary:
  It's only used in InstructionSelection.cpp and anywhere else that
  header is included it causes an unused function warning.
diff: @@ -43,8 +43,6 @@ class InstructionSelection {
  Stats m_stats;
  };
  -static std::array<DexOpcode, 3> move_opcode_tuple(DexOpcode op);
  -
  DexOpcode select_move_opcode(const IRInstruction* insn);
  DexOpcode select_const_opcode(const IRInstruction* insn);
  