HEVC : added assembly MC functions
Merge branch 'ffmpeg_patch' of https://github.com/OpenHEVC/FFmpeg.git
into ffmpeg_patch

Conflicts:
	libavcodec/hevcdsp.c
	libavcodec/x86/hevc_mc.asm
	libavcodec/x86/hevcdsp.h
	libavcodec/x86/hevcdsp_init.c