Integrate HBD row/column flip fwd txfm SSE4.1 optimization

- Integrate 5 flip transform types for each 4x4, 8x8, and 16x16
  block, for experiment, EXT_TX.
- Encoder speed improves about 12%-15%.
- Update the unit tests for bit-exact result against C.

Change-Id: Idf27c87f1e516ca5b66c7b70142477a115404ccb
5 files changed