Fixes an issue with reducing branch cts in the encoder causing
a drop in performance. The bug was introduced in a previous
clean up patch.

Test: Went back to the offending patch, applied this same fix
to it, and checked that results are identical to the parent
of that patch.

Change-Id: I0bad8e2d930235d0284300fcebf836ceb56f2498

Also merge all counters. This removes a few unused probability updates
from the bitstream.

Change-Id: I20f58853e9dac84d8c0d9703ae012c55917516eb

This commit enables iterative motion search for 4x4/4x8/8x4 block
size compound inter-inter prediction.

WIP: borg run testing

Change-Id: I2b318db4a03cdca5a8002b3fa6c0fa89b129288b

Fixes:
error C2121: '#' : invalid character : possibly the result of a macro expansion

Change-Id: I63d7ebba29f3a3cbb546406be39270290e9dc47d

Added two flags to the frame header:

intra_only:
Signals that the frame is encoded using only INTRA
coding modes.

reset_frame_context:
Indicates that the coding context specified
in the frame header should be reset to default values before the
frame is encoded/decoded.

Change-Id: I182d46f1f84fb67a13c46ad767f246a38d7861a2

We could remove calling set_scale_factors() since it is also
done in set_refs() right after vp9_decode_mb_mode_mv() call in
decode_modes_b().

Change-Id: I9e62c90ffb770240987cd42815786567261b5d97

This patch changes the coefficient tree to move the EOB to below
the ZERO node in order to save number of bool decodes.

The advantages of moving EOB one step down as opposed to two steps down
in the other parallel patch are: 1. The coef modeling based on
the One-node becomes independent of the tree structure above it, and
2. Fewer conext/counter increases are needed.

The drawback is that the potential savings in bool decodes will be
less, but assuming that 0s are much more predominant than 1's the
potential savings is still likely to be substantial.

Results on derf300: -0.237%

Change-Id: Ie784be13dc98291306b338e8228703a4c2ea2242

For 4x4 blocks valgrind points out the cache was uninitalized.
This resolves the issue by setting it.

Change-Id: I22733000da048643762813a84fbda66d8e4040d2

This commit makes clean-ups in the rate-distortion loop for 4x4,
4x8, and 8x4 block sizes for the use of iterative motion search.

Removed unnecessary use of bmi in handle_inter_mode.

Deprecated loop over labels in the 4x4/4x8/8x4 block rd search.

Change-Id: I71203dbb68b65e66f073b37abd90d82ef5ae6826

scales for second reference frame vars are unitialized if the
second ref frame is one of of those disallowed by refframeflags

Change-Id: I4ce42de391178c1699dcaede18c5f12c84993c61

Proposal for tuning the residual coding by changing how the context
from previous tokens is calculated. Storing the energy class of previous
tokens instead of the token itself eases the critical path of
HW implementations.

Change-Id: I6d71d856b84518f6c88de771ddd818436f794bab

Change-Id: Ic40d56fb162f4e201547dfae33e62ccd9e865889

Change-Id: I0e789bdeaed60f920f7a470e56a8d4ea374233fc

Adding API to read/write uncompressed frame header bits (it is not final
yet). Separate functions to read/write uncompressed header. Moving
clr_type, error_resilient_mode, refresh_frame_context,
frame_parallel_decoding_mode, frame_context_idx from compressed partition
to uncompressed frame header.

Change-Id: Id3ed8a387980c652ae147549412f4ec24a0a5bd0

Fixes a build issue due to removal of VP9_KF_BINTRAMODES macro,
when ENTROPY_STATS is on.

Change-Id: I75c61702bf626376c942ab49ab887714b43284f0

Uses reduced arrays for probabilities and branch counts in the
encoder. No change in bitstream.

Change-Id: Iec605446f44db4cd325eb45fa12a3003a6ee29db

This commit pulls the iterative motion search for compound inter-
inter out from handle_inter_mode_ as a separate function. Hence,
it is applicable to 4x4/4x8/8x4 level compound inter search to be
enabled later.

Also edit the rd loop for 4x4 inter block sizes for cosmetic
purpose.

Change-Id: Ibc71a11cbe5a26cd52faba01026cf8446cf4d2b4

Removed one 4x4 prediction step that was unnessary in the rd loop.
Removed a unused modecosts estimate from encoder side.

Change-Id: I65221a52719d6876492996955ef04142d2752d86

This reverts commit df037b61

Change-Id: I1a529f2590df7bc912f5035d22311268933e3dd6