code: def equiv(self, instr):
          
          return type(self) == type(instr) and self.arg == instr.arg
docs: Check equivalence of instructions. This checks against the types
          and the arguments of the instructions
  
          Parameters
          ----------
          instr : Instruction
              The instruction to check against.
  
          Returns
          -------
          is_equiv : bool
              If the instructions are equivalent.
  
          Notes
          -----
          This is a separate concept from instruction identity. Two separate
          instructions can be equivalent without being the same exact instance.
          This means that two equivalent instructions can be at different points
          in the bytecode or be targeted by different jumps.