Add ALLOW_RECODE_FIRST speed mode.
This patch is to address concerns that changes to allow recodes on the first frame in each ARF group do not give a good enough speed quality trade off for speed 2. Though the average impact on encode speed is 1-2%, for some hard clips it is > 5% rise. For speed 1 this is less an issue and for Speed 0 the previous patch actually improves speed. Change-Id: Ie1bcefdbfdf846d3f4428590173f621465dffe3a
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