Stack the rate-distortion statistics in the sub8x8 rd loop. This allows
the encoder to skip the forward transform, quantization, and coeff cost
estimation, in the sub8x8 rd optimization search, if the motion
vector(s) are of integer pixel value, and have been tested in the
previous prediction filter type rd loops of the same block.

This gives about 2% speed-up for bus_cif at 2000 kpbs, for speed 0.
Its efficacy depends how frequently the motion search will select an
integer motion vector.

Change-Id: Iee15d4283ad4adea05522c1d40b198b127e6dd97

Mode search order in rd loop changed to better reflect
observed hit counts.

Also some adjustment of the baseline mode rd thresholds
to reflect the order change and observed frequencies.

Change-Id: I47a131cc83e11551df8add6d6d8d413d78d3a63c

This cl fixes issues rbultje brought up. that I somehow neglected when I
submitted yaowu's patch.

Change-Id: I07ad18796317822510b96e951c88d29f194a3c2e

When CONFIG_POSTPROC is set there was a now
invalid reference to cm->filter_level.

Changed to cpi->mb.e_mbd.lf.filter_level in line with
change Iaf5fb71c33719cdfa1b991f671caf071be9ea035

Change-Id: If746e60044903f7ba8d0d346225b3d015226c7d0

This commit allows the encoder to skip a few buffer update steps in
rd_pick_best_mbsegmentation, when early breakout has been triggered
in the rd_check_segment_txsize. It provides about 1% speed-up for
bus_cif at 2000 kbps, in the settings of speed 0.

Change-Id: Ica034f10a24dec572b397d8389a2b81020ebc0b9

At speed 2, due to the threshold scheme used, it is possible the rate
and distortion assigned with INT_MAX value. The patch added checking
to prevent the INT_MAX value is used in further calculation of RD
scores. The patch also changed the assertion in rd_use_partition() to
be mirror similar assertion in rd_pick_partition().

Change-Id: Idb52c543cc1e10abdf6e6a5d6e9cb535a42214dc

Using cm->frame_contexts[cm->frame_context_idx] as source of previous
probabilities.

Change-Id: Ie03778acf0e7bebdc3a1f6a51854d4a0712f24a1

Adding loopfilter struct with fields from MACROBLOCKD and VP9Common.
Eventually it will be moved to vp9_loopfilter.h for better code structure.

Change-Id: Iaf5fb71c33719cdfa1b991f671caf071be9ea035

Removed arrays: kf_boost_seperation_adjustment,
                gf_adjust_table,
                gf_intra_usage_adjustment,
                gf_interval_table.

Change-Id: I62e400cb6e4d039787615169a3779e31ebf95893

Changing fc->tx_probs back to fc->pre_tx_probs. This change actually
affects the bitstream but current test vectors work. Chrome branch is not
affected at all. Broken since:

cc662dd7 Adding struct tx_probs and struct tx_counts to cleanup the code.

Change-Id: I36dd4b3678e902e10aba8dd49b0012eb558c209d

Change-Id: Ic741054836d6c1b89c4f1c75cc6bd938a7d56723

Change-Id: Ibf2555f1c0d00e91d416eb39201a5a91df7fab27

Change-Id: Ia4e83913251c1cdc7aa2abd64bf01ecb1a962119

Moving TX_MODE enum to vp9_enums.h. Renaming txfm_mode variables to
tx_mode.

Change-Id: I459d1af6dd928ce7fccdf8ce30b6f1ca057bef92

Functions: vp9_get_pred_context_switchable_interp,
           vp9_get_pred_context_intra_inter,
           vp9_get_pred_context_single_ref_p1,
           vp9_get_pred_context_single_ref_p2.

Change-Id: I3d6fb8aee23c9062270768e1e6da416dd9bb8f96

Renaming vp9_sb_mv_ref_tree to vp9_inter_mode_tree, and
vp9_sb_mv_ref_encoding_array to vp9_inter_mode_encodings.

Change-Id: I0e91fbf81350d3ec5a2599064c74089b5d06133a

Change-Id: I4032dd0442043543954dcb3724df974b7cc7e515

Change-Id: I9a4df095732d561807de01a41dcb1a1960726a3c