Revert "VP9_COPY_CONVOLVE_SSE2 optimization"
This reverts commit a5e97d87. Additionally: Revert "vpx_convolve_copy_sse2: fix win64" This reverts commit 22a8474f. 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
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