NEW_MULTISYMBOL: adapt comp_inter_mode.

Change-Id: I2e783a16418708c6403de3c2e84450dbc83df3b7
diff --git a/av1/common/pred_common.h b/av1/common/pred_common.h
index ecbe12f..7148849 100644
--- a/av1/common/pred_common.h
+++ b/av1/common/pred_common.h
@@ -101,6 +101,12 @@
                                                    const MACROBLOCKD *xd) {
   return cm->fc->comp_inter_prob[av1_get_reference_mode_context(cm, xd)];
 }
+#if CONFIG_NEW_MULTISYMBOL
+static INLINE aom_cdf_prob *av1_get_reference_mode_cdf(const AV1_COMMON *cm,
+                                                       const MACROBLOCKD *xd) {
+  return xd->tile_ctx->comp_inter_cdf[av1_get_reference_mode_context(cm, xd)];
+}
+#endif
 
 int av1_get_pred_context_comp_ref_p(const AV1_COMMON *cm,
                                     const MACROBLOCKD *xd);