Refactor the code for reference frame flag setup
At the encoder side, for the 7 reference frames, we always set up the priority rank as follows: LAST, ALTREF, LAST2, LAST3, GOLDEN, BWDREF, ALTREF2 That is, if two reference frames point to the same reference frame buffer, the flag for the latter frame in the rank will always be turned off. This patch does not change any coding performance / coding speed for the default configure setup. It only affects the following setup: one-sided-compound is on && ext-comp-refs is off As one-sided-compound is enabled by default when ext-comp-refs is enabled, and ext-comp-refs is enabled by default, above setup should not be considered. Change-Id: I6de18d3be938e1d4a8897e5ba0857b8d21e7f9d0
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