Revert "VP9_COPY_CONVOLVE_SSE2 optimization"

This reverts commit a5e97d874b16ae5826b68515f1e35ffb44361cf8.

Additionally:
Revert "vpx_convolve_copy_sse2: fix win64"

This reverts commit 22a8474fe7ec30d96f746dc6e4b23771758c071e.

This change performs poorly on various x86_64 devices affecting
performance by 1-3% at 1080P. Performance on chromebook like devices was
mixed neutral to slightly negative, so there should be minimal change
there.

Change-Id: I95831233b4b84ee96369baa192a2d4cc7639658c
1 file changed