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1) Add txb_entropy_ctx into MACROBLOCK_PLANE and PICK_MODE_CONTEXT

2) Add av1_get_txb_entropy_context() to compute the entropy context

3) Compute and sore the entropy context before av1_xform_quant()
return

Change-Id: Ia2170523af3163b9456f7c6a305c1e77ad2b23be

1) move the original implementation in av1_cost_coeffs() to
cost_coeffs() and let av1_cost_coeffs become a switch for
choosing original coeff cost or lv_map's coeff cost

2) change get_txb_ctx's naming. Use plane_bsize instead of
bsize to make the intention clear.

3) remove txb context computing in get_txb_ctx
Change-Id: I17e3d39d796e051d1c90f0a0c5d7d0888b9ca292

Change-Id: I6bedc3a1a40e551ce4b3989382b7706a589c08f2

Change-Id: Icbf9a2f31eb7f6c385266a0236d2ef266f43e409

The feature is implemented in the following two functions.
av1_write_txb_probs
av1_read_txb_probs

Change-Id: I0b646e17ec54d7a10a77a6853439217091455af1

Change-Id: I497221e91c576bc684ee65bcdbab1469b8821fe1

This a simple implementation.
We will use a more precise buffer size for tcoeff once the
experiment functions correctly.

Change-Id: Ib561974f21ee1b8d72ce407882ea2be3cf0b069f

Generate txb_ctx which contains both txb_skip_ctx and dc_ctx
directly

Change-Id: I5058b72e0b6431a9daf0536925c71da590cf7aeb

This function go through each transform block in the
prediction block and call av1_write_coeffs_txb to
pack coefficients into the bitstream

Change-Id: I6dedebef6cf8957f9173241a7de60e9936bc0be8

This draft version only pass compiling check, it's not working yet.

The following goal is to use new coding system when doing bitstream
packing but keep old coding system in RD loop.

Change-Id: I224a1581d1cc5c67d73e71558fb77d9faf9c2470

Doing tokenize in the last step of RD loop and then doing packing
tokens in bitstream packing phase is hard for debugging.

Therefore, we create a frame-level buffer to store the txfm coeffs
from the reconstruction in RD loop and then in bitstream packing
phase, we can code the txfm coeffs directly.

Change-Id: I999470eef6e038317a91585df2bdfc20aca3573e

Change-Id: I44842387207b19f8e0c3894d3f4e8d0646a4cafd

Change-Id: Ifcdd3ce2953c1ecb1d0962da412a4b5ba2cda912

Change-Id: I222b5ce9ee1a1c1aac5620b94835967dd9a014c1

Change-Id: I70c3659940b5090f030c795df5148ac508e19d2d