Fix early free of assign_obj op_data

We need to make sure that op_data is only freed after populating
result, as op_data may be the only thing holding the value in the
case of an ove

Fix early free of assign_obj op_data

We need to make sure that op_data is only freed after populating
result, as op_data may be the only thing holding the value in the
case of an overloaded assignment.

This reverts the code to how it looked like in 7.3.

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