Add an SSE4 version of some lossless color transforms.
Add an SSE4 version of some lossless color transforms.

Change-Id: Ieac094f684116d1292793b2ca321f6f1a69565b5

webmproject/libwebp,webmproject/libwebp,PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,webmproject/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,PKRoma/libwebp