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Reland "Enable tpl model for speed 0"

This is a reland of 9c2c234a0b8f9c08719ac1fa286988a0a3626fd0

Threaded mismatch has been addressed.

Original change's description:
> Enable tpl model for speed 0
>
> Enable adaptive Lagrangian multiplier for arf in speed 0, AQ mode 0,
> and low bit-depth settings. This improves the peak compression
> performance:
>
>           avg PSNR       overall PSNR       SSIM
> low       -0.462%         -0.535%          -0.358%
> mid       -0.780%         -0.857%          -0.868%
> hd        -0.914%         -1.017%          -0.471%
> 720p      -0.624%         -0.671%          -1.553%
> nflx2k    -0.764%         -0.784%          -0.908%
>
> The encoding time at speed 0 is slightly changed to be faster or
> slower:
>
> city_cif 1000 kbps
> 78.2 seconds -> 78.1 seconds
>
> bus_cif 1000 kbps
> 98.6 seconds -> 98.8 seconds.
>
> Change-Id: I18e7337bb61d985cbd3cf29e56439a6cdf675389

BUG=webm:1547

Change-Id: I025a21683ceed23d5f7147e200555b58b791315c

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1958,10 +1958,10 @@

     if (cyclic_refresh_segment_id_boosted(

             get_segment_id(cm, map, bsize, mi_row, mi_col)))

       x->rdmult = vp9_cyclic_refresh_get_rdmult(cpi->cyclic_refresh);

+  } else {

+    if (cpi->sf.enable_tpl_model) x->rdmult = x->cb_rdmult;

   }

-  if (cpi->sf.enable_tpl_model) x->rdmult = x->cb_rdmult;

-

   // Find best coding mode & reconstruct the MB so it is available

   // as a predictor for MBs that follow in the SB

   if (frame_is_intra_only(cm)) {

@@ -2122,7 +2122,10 @@

                      PICK_MODE_CONTEXT *ctx) {

   MACROBLOCK *const x = &td->mb;

   set_offsets(cpi, tile, x, mi_row, mi_col, bsize);

-  if (cpi->sf.enable_tpl_model) x->rdmult = x->cb_rdmult;

+

+  if (cpi->sf.enable_tpl_model && cpi->oxcf.aq_mode == NO_AQ)

+    x->rdmult = x->cb_rdmult;

+

   update_state(cpi, td, ctx, mi_row, mi_col, bsize, output_enabled);

   encode_superblock(cpi, td, tp, output_enabled, mi_row, mi_col, bsize, ctx);

@@ -3710,7 +3713,9 @@

   int rate_breakout_thr = cpi->sf.partition_search_breakout_thr.rate;

   int must_split = 0;

-  int partition_mul = cpi->sf.enable_tpl_model ? x->cb_rdmult : cpi->rd.RDMULT;

+  int partition_mul = cpi->sf.enable_tpl_model && cpi->oxcf.aq_mode == NO_AQ

+                          ? x->cb_rdmult

+                          : cpi->rd.RDMULT;

   (void)*tp_orig;

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -843,7 +843,11 @@

   sf->allow_quant_coeff_opt = sf->optimize_coefficients;

   sf->quant_opt_thresh = 99.0;

   sf->allow_acl = 1;

+#if CONFIG_VP9_HIGHBITDEPTH

   sf->enable_tpl_model = 0;

+#else

+  sf->enable_tpl_model = 1;

+#endif

   for (i = 0; i < TX_SIZES; i++) {

     sf->intra_y_mode_mask[i] = INTRA_ALL;