Initalize zeromv_sse and newmv_sse in vp9_pick_inter_mode

These two parameters are used to control the denoiser cut-off
thresholds. They should be properly initialized when starting
mode search of a given block.

Change-Id: Iba8a25487026a0dbe0d350c347d7e4e4e237b637

vp9/encoder/vp9_denoiser.c

diff --git a/vp9/encoder/vp9_denoiser.c b/vp9/encoder/vp9_denoiser.c
index 2266a26..784319f 100644
--- a/vp9/encoder/vp9_denoiser.c
+++ b/vp9/encoder/vp9_denoiser.c
@@ -398,7 +398,10 @@
 
 void vp9_denoiser_reset_frame_stats(PICK_MODE_CONTEXT *ctx) {
   ctx->zeromv_sse = UINT_MAX;
-  ctx->newmv_sse = UINT_MAX;
+  // This should be initialized as zero since mode search stage might skip
+  // NEWMV mode if inferred motion vector modes provide sufficiently good
+  // prediction quality.
+  ctx->newmv_sse = 0;
 }
 
 void vp9_denoiser_update_frame_stats(MB_MODE_INFO *mbmi, unsigned int sse,

vp9/encoder/vp9_pickmode.c

diff --git a/vp9/encoder/vp9_pickmode.c b/vp9/encoder/vp9_pickmode.c
index cf1e997..d9659d1 100644
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -605,6 +605,10 @@
   mbmi->interp_filter = cm->interp_filter == SWITCHABLE ?
                         EIGHTTAP : cm->interp_filter;
 
+#if CONFIG_VP9_TEMPORAL_DENOISING
+  vp9_denoiser_reset_frame_stats(ctx);
+#endif
+
   for (ref_frame = LAST_FRAME; ref_frame <= GOLDEN_FRAME; ++ref_frame) {
     x->pred_mv_sad[ref_frame] = INT_MAX;
     frame_mv[NEWMV][ref_frame].as_int = INVALID_MV;