Change the B-frame coding structure.
Originally we can have a BRF right before an overlay frame (in display order), which might be unnecessary since we already has a quality backward reference frame (ARF). This patch avoids such a coding structure and improves the RD performance by 0.086% in Avg in the lowres dataset, and 0.153 in Avg in the midres dataset. In the lowres dataset, significant gains are obtained for the following sequences: mobisode2_240p: 0.563% keiba_240p: 0.440% bus_cif: 0.336% soccer_cif: 0.333% And the performance drops only in the following four video sequences: motherdaughter_cif: 0.028% bqsquare_240p: 0.017% basketballpass_240p: 0.015% bowing_cif: 0.006% Change-Id: Ic94f648ba8e52eb0014933d484fb247610a9ae05
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