Otherwise the first-in-pair instructions can run ahead, latching their
inputs for the next pair before the second-in-pair insts finish compute
on the current one. Might introduce more frontend stalls, need more
experimenting
Since operand and commit throughput are the same (2 cycles), it is
unnecessary to stall the dpu during the multi-cycle commit.
This enables the dpu to operate at full throughput of 1 operand every 2
cycles.
