In private_instr_encode, use MAX_INSTR_LENGTH instead of "32".
In private_instr_encode, use MAX_INSTR_LENGTH instead of "32".

Review-URL: https://codereview.appspot.com/319130043

AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio