Use emmintrin.h for SSE includes. This header should work on all available platforms, instead of the platform-specific intrin.h or x86intrin.h. BUG=angle:773 Change-Id: Ia012053064838f9893aa647d872e136a47cfad1a Reviewed-on: https://chromium-review.googlesource.com/240552 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>