vp9 non-rd pickmode: Add limit on newmv-last and golden bias.
Add option, for newmv-last, to limit the rd-threshold update for early exit, under a source varianace condition. This can improve visual quality in low texture moving areas, like forehead/faces. Also add bias against golden to improve the speed/fps, will little/negligible loss in quality. Only affects CBR mode, non-svc, non-screen-content. Change-Id: I3a5229eee860c71499a6fd464c450b167b07534d
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