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