hkuang 4cc7c5a17f Totally remove prev_mi in VP9 decoder.
This will save the memory and improve the decode speed due to
removing unnecessary memset of big prev_mi array for
all the key frames.

Decoding a all key frames 1080p video shows speed improve around 2%.

Change-Id: I6284a445c1291056e3c15135c3c20d502f791c10
2014-11-05 16:14:30 -08:00
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