vp9: add avx2 iadst16 implementations

Multimedia / FFmpeg - Ronald S. Bultje [gmail.com] - 15 November 2016 10:01 UTC

Also a small cosmetic change to the avx2 idct16 version to make it explicit that one of the arguments to the write-out macros is unused for >=avx2 (it uses pmovzxbw instead of punpcklbw).

83a139e vp9: add avx2 iadst16 implementations.
libavcodec/x86/vp9dsp_init.c | 8 +-
libavcodec/x86/vp9itxfm.asm | 188 +++++++++++++++++++++++++++++++++++++++---
2 files changed, 183 insertions(+), 13 deletions(-)

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