vp9: Adjustments for ARF usage in 1 pass vbr.
Only when USE_ALT_REF_ONE_PASS is enabled (off by default). Force fixed partition to 64x64 when is_src_alt_ref_frame is true, and don't force early exit for some modes in nonrd_pickmode for ARF noshow frames. Small gain ~0.2% on ytlive metrics for speed 6. Neutral speed difference. Change-Id: I27eb6622d0453c09a06ccdc3b16368762474d11d
Showing with 8 additions and 3 deletions