avcodec: loongson optimize h264dsp idct and loop filter with mmi
Change-Id: Ic87fb8f5cd22a502ff9dbbc5a5a8ea97cfc8a1dd Signed-off-by: ZhouXiaoyong <zhouxiaoyong@loongson.cn> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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