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/240552Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>