Simplify rate-distortion modeling function

Use left shift to replace one multiplication. The computation
outcome remains identical.

Change-Id: I1e1737af0a245de0d2a2bde10f0c171477199fc1
VP9 common for ARMv8 by using NEON intrinsics 05

Add vp9_iht4x4_add_neon.c
- vp9_iht4x4_16_add_neon

The assembly did not previously implement tx_type 0
BUG=715

Change-Id: I60034d1568de034edba45c5cdd13f3d87dbc73b6
Signed-off-by: James Yu <james.yu@linaro.org>
VP9 common for ARMv8 by using NEON intrinsics 06

Add vp9_iht8x8_add_neon.c
- vp9_iht8x8_64_add_neon

The assembly did not previously implement tx_type 0
BUG=716

Change-Id: Icfc99dd24f3d59047f9184a7d0c761ba7e3de934
Signed-off-by: James Yu <james.yu@linaro.org>
Merge "Simplify rate-distortion modeling function"
Merge "VP9 common for ARMv8 by using NEON intrinsics 05"
Merge "VP9 common for ARMv8 by using NEON intrinsics 06"