This is an attempt at rewriting vp9_find_mv_refs_idx.   I believe that it gains
about 1-2% decode speed

Change-Id: Ia5359c94ce9bb43b32652890e605e9a385485c1b

Using it instead of long unclear verbose check
"mbmi->ref_frame[0] != INTRA_FRAME".

Change-Id: I9c7b4b3797942fa962bf3ba7460fff3084beabe9

Change-Id: I8f21c18b29f54b277fb1c167f278f109d9f3b996

Change-Id: Ic878d31df2ce783a2c9a8c4bc9ed301ec8ffe25e

Change-Id: I3fe90eb40088a5b07bdc7d66d93ffe6ef99943d5

Change-Id: Ic07f5f8ffeaedd5b7513b464871f83afc82dcd5c

Change-Id: I0e9329490828684a4fd46f540d89114cc68e8407

Change-Id: I5d6906772e6e6adf68d7f0fd5b8b5207a64a3a37

Change-Id: Ic7cacd02d6dc9243ad8fc85082c5618a9d1e66dc

Loading to single lanes in multiple registers is expensive since
it requires a read and write of each register which saturates
the register file access.  Loading to single registers followed
by a separate transpose reduces this pressure.

Change-Id: I4cc35887ddbca80e5e635b50d2b1d158de9668ee

Change-Id: I13e0880df234f15abc4cc7c57fe84488d5d46a75

Change-Id: I73b59d7699a8e7e7acd3bf8041cb6c98ce9ba4bf

Change-Id: I8715f08a3554bdb557c5f935f1dfbd671f18e766

Change-Id: I27471768980fc631916069f24bc7c482a5c9ca17

Removing assign_and_clamp_mv function, making implementation of clamp_mv
and clamp_mv2 more clear and consistent.

Change-Id: Iecd08e1c1bf0379f8314ebe01811f8253f4ade58

Adds a function to compute source variance for various
sb_types to be used for pruning mode and partition searches.
[The existing activity measure function is currently specialized
for only 16x16 MBs and needs to be updated].

Change-Id: I22a41e6f1430184201487326fdbebb9b47e6fc24

The inverse 32x32 transform detects all zero entries and skips the
computations accordingly per 8 rows in the first 1-D operation. The
function vp9_short_idct10_32x32_add performs differently and is not
used anywhere, hence removed.

Change-Id: Ic4fad422debbde7b6b6ffed47c69fbd4268a906c

If the partition is out of partition size range, we don't
need to process small partition information.

Change-Id: Ice9bfbbdebe1f2ef79271a3aee17de0ed4608376

use_min_partition_size and use_max_partition_size are not used
currently, and could be added back if needed later.

Change-Id: Ib22a9c06b064567a7c1d6d5445567ed77e0d3acc