remove parallel-reduction mode from decoder and sv/trans/svp64.py

remove parallel-reduction mode from decoder and sv/trans/svp64.py
parallel reduction has to be done through REMAP due to two critical factors:
1) the amount of gates in joining REMAP with PREDUCE as a "Mode"
2) the differing Vector Length (similar to Matrix) from the number of
   operations needed to be performed
the complexity arising is too great which means it has to be done as REMAP