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Force bsize for UV in I4X4 and SPLITMV

Use 4x4 block coding for UV components arbitrarily in I4X4_PRED and
SPLITMV coding modes. This is a temporary solution to enable
bit-stream support for recursive partition down to 4x4 block size.
Will separate the functionalities of 4x4 block coding rate-distortion
out from those of superblocks.

Change-Id: I03dc15d5897014f175f3f2c91e9b266091d56797

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -2294,7 +2294,9 @@

   mode = xd->mode_info_context->mbmi.mode;

   txfm_size = xd->mode_info_context->mbmi.txfm_size;

   rd_pick_intra_sbuv_mode(cpi, x, &rate_uv, &rate_uv_tokenonly,

-                          &dist_uv, &uv_skip, bsize);

+                          &dist_uv, &uv_skip,

+                          (bsize < BLOCK_SIZE_SB8X8) ? BLOCK_SIZE_SB8X8 :

+                                                       bsize);

   if (bsize == BLOCK_SIZE_SB8X8)

     err4x4 = rd_pick_intra4x4mby_modes(cpi, x, &rate4x4_y,

                                        &rate4x4_y_tokenonly,

@@ -2730,10 +2732,10 @@

       // If even the 'Y' rd value of split is higher than best so far

       // then dont bother looking at UV

       vp9_build_inter_predictors_sbuv(&x->e_mbd, mi_row, mi_col,

-                                      bsize);

-      vp9_subtract_sbuv(x, bsize);

+                                      BLOCK_SIZE_SB8X8);

+      vp9_subtract_sbuv(x, BLOCK_SIZE_SB8X8);

       super_block_uvrd_for_txfm(cm, x, &rate_uv, &distortion_uv,

-                                &uv_skippable, bsize, TX_4X4);

+                                &uv_skippable, BLOCK_SIZE_SB8X8, TX_4X4);

       rate2 += rate_uv;

       distortion2 += distortion_uv;

       skippable = skippable && uv_skippable;

-- 

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