Migrates costing changes/fixes from the rebalance expt to the head
without the expt on.

Rebased.

Change-Id: I51677d62f77ed08aca8d21a4c9a13103eb8de93f
Results:
derfraw300: +0.126%

Moving some code from vp9_pack_bitstream to encode_txfm function.

Change-Id: Icc25d6083e54f09886216fea632ceac002042d7f

Change-Id: Ie869ea4992e26867caec46cb878fc86a646aeb9f

Change-Id: I02c17fb733c0f3c22dc3167c3d3182797415f1ae

Change-Id: I615125483da71a623a930d6e20c42df82ea0e6ee

Change-Id: I2dfc569106b29fbe4da20585a0e85e5e9ea6a4db

speed >1 can be spead up by turning these on - lost in a prior commit

Change-Id: Iaef85e10ecfeec3aea5ab0e691edf02bb7f5190d

Change-Id: Ibaa47be878c1cd84d88d7518418d2d8d38224e70

And removed 1st pass specific version of intra coding funcitons

Change-Id: Ia54e67c71d750957cb2efda8360bf2133468498a

Change-Id: Ieb4a8c97bf1b1dfb993f40a9a3ef3bed5ae7d948

This speed 1 - uses variance threshold stolen from static-thresh
to determine split.  Any superblock with greater than the variance
set by static thresh * quantizer index squared is split. In addition
transform size is set to largest size less than or equal to partition
size, sub pixel filter is set to normal,  and only 12 modes are used
at all.

Change-Id: If7a2858ee70f96d1eb989c04fd87a332b147abef

* changes:
  Remove i4x4_pred.
  Remove unused table.

Change-Id: Ic6555128206d61f47a46c550cb3dcaf3b4ec6374

These are now merged in a new define called VP9_INTRA_MODES.

Change-Id: I0890f895756a7395d84c92f98f43e43f4cf9050d

Change-Id: I715870513d1fef8471bfd0f5218a79360a1ef126

Change-Id: Ieb4669ae564bec9f3051485ecdf186cb4e00decb

We leave it in rdopt.c as a local define for now - this can be removed
later. In all other places, we remove it, thereby slightly decreasing
the size of some arrays in the bitstream.

Change-Id: Ic2a9beb97a4eda0b086f62c039d994b192f99ca5

It remains as a local define in rdopt.c so we can distinguish between
split and non-split modes in the RD loop, but disappears outside that
scope in the codec.

Change-Id: I98c18fe5ab7e4fbd1d6620ec5695e2ea20513ce9

Change-Id: I80c37cffa176bac942ab3051abdfd585ed5555e1

The commit changed to use a new variant of Walsh-Hadamard Transform
by Tim Terriberry. This new variant has the best compression among a
number of variants that developed by Tim.

Change-Id: Icb3a88515463cfc644b17ca046fcd139db2557e9

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