Use emplace_back to push DicNode to vector.

Before:
(0)  2234.43 (0.71%)
(1)  310083.71 (99.07%)
(2)  626.88 (0.20%)
(66)  0.26 (0.00%)
Total 312995.33 (sum of others 312945.28)

After
(0)  2266.21 (0.79%)
(1)  285422.05 (98.97%)
(2)  642.62 (0.22%)
(66)  0.19 (0.00%)
Total 288384.35 (sum of others 288331.07)


Change-Id: I5ab98076c54d147ff7ec2a29280859f4558e24d0