- Const correctness
- Refactoring
- Make variables local when possible etc
- Remove -Wcast-qual to allow explicitly casting away const.

Cherry-picked from aomedia/master: c27fcccc
And then a number of more const correctness changes to make sure other
experiments build OK.

Change-Id: I77c18d99d21218fbdc9b186d7ed3792dc401a0a0

Change-Id: Ibc73b4066dcdee45d32355144124762d26a16a28

Change-Id: Ifcc329df240c0771172180933a6180b21fd31abe

This is not used since the commint 00cd5de5,
"Remove skip_recode speed feature".

Change-Id: Ic03da6c0095f6285a3889d5d22e8aaa2e6cbfd79

On average no compression performance changes. Encoding speed is
increased by 10~20% on some test clips in the derf set.

Change-Id: I9856caaa260303f6f6259686671bed7d51012277

Drop some speed features used in speed 2 and above, during the
algorithm development process. This helps simplify the codebase.

Change-Id: I3b2f5560d90b00d2d8fd57c2cb36f6ddd3f228e4

Change-Id: I65c04006f6e6eb13ceb22efc1c39915cb3c82b82

Change-Id: Ic11eae36c9c62a20699197847aa3ef9562d4ad7e

Change-Id: Ie90dd06c387119ccd9c920a328c942477df00bb7

This commit ports the following from aom/master:
4c462788 Add aom_reader_tell() support.
b9c99350 Remove an erroneous declaration.
56c9c3bf Fix ANS build.

Change-Id: I59bd910f58c218c649a1de2a7b5fae0397e13cb1

This computation should match the code in encode_block
to increase the accuracy of the rd optimization.

Change-Id: Ibc9d9ab6d88d0c0f3af62e9cc233216aba48a57e

When built with var_tx and ext_tx, select_tx_size_fix_type is used
to compute the cost for using a particular tx_type.
The code indexes the array inter_tx_type_costs at the wrong location
resulting in a zero cost for signalling tx_type for rect_tx blocks.

Change-Id: Iba38be3a0d822109f778f0600b242dfb40359766

Change-Id: I33899eca44300037816c9f20c965aa8311a1ef52

Change-Id: I35f85bad88c637cea62577c546cdd5ced0e21bd6

Will break ext-intra into 2 experiments: ext-intra and filter-intra.

Change-Id: Ibf66e9b9d9307fd58a703eada9569b74d171434b

To get ready for pulling AV1 to nextgenv2. Refactoring is done to
make the code structures similar, especially for the motion search
part.

Change-Id: I5d7636394408d97de55394d668540f5627827983

Cherry-pick Daala 211c2a41: Clean up EC tell() and tell_frac() functions.
Add a const qualifier to the od_ec_enc and od_ec_dec parameters of
 the od_ec_enc_tell(), od_ec_enc_tell_frac(), od_ec_dec_tell(), and
 od_ec_dec_tell_frac() functions.
Add an OD_WARN_UNUSED_RESULT to od_ec_enc_tell_frac().

Change-Id: Ia50e2fd75e98d8a03d993449d658b695cf56e6fb

The formatting of OD_UNIFORM_CDFS_Q15[] in entcode.c is helpful for
 for understanding what is contained in the array (e.g., the uniform
 probability distributions of small sizes 2 through 16).
This patch reverts the change made in f4b2926d and adds linter hints to
 ignore the formatting.

Change-Id: I2ad9fe6673b86e6067cb97b40f0f0e69a119cdf5

Change-Id: I7c088c55f1c461063976d5bd84ff2026c4f3bc69

In super_block_uvrd(),if is_cost_valid == 0, all return parameters,
i.e. rate, distortion, skippable, and sse, are reset.
So, should not call txfm_rd_in_plane() if is_cost_valid == 0.
Also, the bug causes av1_xform_quant() to see invalid diff signal
since av1_subtract_plane() is not called in super_block_uvrd().

Change-Id: Iaa06061e2e9aa8876b4611a54f4ae6b8d499332b