Adding const to several pointers.

Change-Id: I7231589bda71d0d23c730283febd5bb58585a0da

vp9/common/vp9_entropy.c

@@ -657,10 +657,10 @@ void vp9_coef_tree_initialize() {
 static void adapt_coef_probs(VP9_COMMON *cm, TX_SIZE tx_size,
                              unsigned int count_sat,
                              unsigned int update_factor) {
-  FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];
+  const FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];
 
   vp9_coeff_probs_model *dst_coef_probs = cm->fc.coef_probs[tx_size];
-  vp9_coeff_probs_model *pre_coef_probs = pre_fc->coef_probs[tx_size];
+  const vp9_coeff_probs_model *pre_coef_probs = pre_fc->coef_probs[tx_size];
   vp9_coeff_count_model *coef_counts = cm->counts.coef[tx_size];
   unsigned int (*eob_branch_count)[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS] =
       cm->counts.eob_branch[tx_size];

vp9/common/vp9_entropymv.c

@@ -214,11 +214,11 @@ static unsigned int adapt_probs(unsigned int i,
 void vp9_adapt_mv_probs(VP9_COMMON *cm, int allow_hp) {
   int i, j;
 
-  FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];
+  const FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];
 
   nmv_context *ctx = &cm->fc.nmvc;
-  nmv_context *pre_ctx = &pre_fc->nmvc;
-  nmv_context_counts *cts = &cm->counts.mv;
+  const nmv_context *pre_ctx = &pre_fc->nmvc;
+  const nmv_context_counts *cts = &cm->counts.mv;
 
   adapt_probs(0, vp9_mv_joint_tree, ctx->joints, pre_ctx->joints, cts->joints);