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vp9 denoiser: force copy block when last not a reference.

Last reference doesn't always exist when SVC layers changed dynamically.

When last is not a reference for current layer, copy block directly on
denoiser.

Change-Id: I9d98c4d6fdcfa25ba707db3333712761b5cf9ab8

--- a/vp9/encoder/vp9_denoiser.c

+++ b/vp9/encoder/vp9_denoiser.c

@@ -360,6 +360,7 @@

   int is_skin = 0;

   int increase_denoising = 0;

   int consec_zeromv = 0;

+  int last_is_reference = cpi->ref_frame_flags & VP9_LAST_FLAG;

   mv_col = ctx->best_sse_mv.as_mv.col;

   mv_row = ctx->best_sse_mv.as_mv.row;

   motion_magnitude = mv_row * mv_row + mv_col * mv_col;

@@ -403,7 +404,12 @@

   }

   if (!is_skin && denoiser->denoising_level == kDenHigh) increase_denoising = 1;

-  if (denoiser->denoising_level >= kDenLow && !ctx->sb_skip_denoising)

+  // Copy block if LAST_FRAME is not a reference.

+  // Last doesn't always exist when SVC layers are dynamically changed, e.g. top

+  // spatial layer doesn't have last reference when it's brought up for the

+  // first time on the fly.

+  if (last_is_reference && denoiser->denoising_level >= kDenLow &&

+      !ctx->sb_skip_denoising)

     decision = perform_motion_compensation(

         &cpi->common, denoiser, mb, bs, increase_denoising, mi_row, mi_col, ctx,

         motion_magnitude, is_skin, &zeromv_filter, consec_zeromv,