Merge "Reuse inter prediction result in real-time speed 6"

diff --cc vp9/encoder/vp9_encodeframe.c
Simple merge

diff --cc vp9/encoder/vp9_pickmode.c
Simple merge

diff --cc vp9/encoder/vp9_speed_features.c
Simple merge

diff --cc vp9/encoder/vp9_speed_features.h
Simple merge