[FFmpeg-devel] [loongson] Optimize H264 decoding.

[Shiyou Yin]

H264 decoding speed: 154fps ==> 165fps, 5.14x ==> 5.53x (tested on 3A4000)

V2: Fixed a build error in [PATCH 2/3].
"Error: opcode not supported on this processor: mips32r2 (mips32r2) `dsbh $10,$10'"

[PATCH 1/3] avcodec/mips: Restore the initialization sequence of MSA. 
[PATCH 2/3] avcodec/mips: Refine get_cabac_inline_mips.
[PATCH 3/3] avcodec/mips: Optimize function ff_h264_loop_filter_strength_msa.