For low resolutions, whem 4x4downsample is used for variance,
use the same force split (that is used for 8x8downsample) for 16x16 blocks.

No change in metrics. Small improvement visually.

Change-Id: I915b9895902d0b9a41e75d37fee1bf3714d2366d

4x4 Intra predictor implemented with MMX is replaced with SSE2.

Change-Id: Id57da2a7c38832d0356bc998790fc1989d39eafc

Change-Id: I57a15aec1cb2d6638f5211d30c2c9f15fb62494f

This is so we may update level at any time (e.g., to be used
for setting thresholds in variance-based partition).

Change-Id: I32caad2271b8e03017a531f9ea456a6dbb9d49c7

Store it in nextgenv2 for now.

Change-Id: Iab0af0e15246758e3b6e8bde4a74b13c410576fc

Do not reset the alt ref active flag when overlaying the middle
arf(s) of a multi arf group.

Change-Id: Ia55a55a376973f3fd17161429fd2afb07b4df31f

Fixes crash in 2pass spatial svc test that was introduced in:
https://chromium-review.googlesource.com/#/c/313571/6

Change-Id: Iab3e8225a8d159cd33f5849dffe6802e25038047

Fixes spatial svc rc assert failure introdcued in:
https://chromium-review.googlesource.com/#/c/312959/1

Change-Id: I6096bfbc484859d71a5fb55e6a3248a31885af61

Fixes bug introduced in
https://chromium-review.googlesource.com/#/c/299482/5

Change-Id: If542c1a917380465dd9bc4ce5e32b0adbb20e340

For non-rd variance partition: only allow minmax computation
(which currently has no arm-neon optimization) for speeds < 8.

Performance loss is small: On RTC set with speed 8, few clips lose ~2/3%,
average loss is < 1%.

Change-Id: Ia9414f4d0b77dc83c3e73ca8de5d903f64b425ce

Relocate h_predictor_4x4 from SSSE3 to SSE2 with XMM registers.
Speed up by ~25% in ./test_intra_pred_speed.

Change-Id: I64e14c13b482a471449be3559bfb0da45cf88d9d

Change initial state of noise level, and only update
denoiser with noise level when estimate is done.

Change-Id: If44090d29949d3e4927e855d88241634cdb395dc

This fix allows to enable reuse_inter_pred.

Change-Id: I53f2bf1163bb0036ffb6df92117a86debdca11d1

Change-Id: I3ba4ede553e068bf116dce59d1317347988b3542

* changes:
  add vp9_satd_neon
  fix vp9_satd_sse2
  vp9_satd: return an int

For denoising, and for noise level above threshold, re-evaluate
ZEROMV for mode selection after denoising.
Current change only does this check if selected best mode (before denoising)
was intra.

Change-Id: I4b1435b68d26c78f7597b995ee7bff0ddd5f9511

Fixes a spatial_svc breakage introduced in
https://chromium-review.googlesource.com/#/c/305228/3.

Change-Id: I7f2cecbdca980addb85d5e58b58b5454f4730ada

~60-65% faster at the function level across block sizes

Change-Id: Iaf8cbe95731c43fdcbf68256e44284ba51a93893

Left neighbor read from memory only once.
Speed up by ~20% in ./test_intra_pred_speed.

Change-Id: Ia1388630df6fed0dce9a6eeded6cb855bbc43505

zeromv_lastref_sse was not reset.

Change-Id: I23c12e804d63dc7dc18514f6efe71de1d1acbd6a

This change makes sure last reference with zero mv
is always checked for mode selection.

No change in metrics.

Change-Id: Iaf01877bf34272b966c78bfe18daad882a0a419e

The counts are never used when frame_parallel_decoding_mode
is set.

Change-Id: I293aa68abadcdd30973adacb9f5f5a3aecf8daa2

Change-Id: Ic0ec32c1d7f7c08c9f956592dccbfd9060b1f624