The SSE code of chacha20poly1305 used PINSRB and PEXTRQ, which are only available on machines supporting SSE4.1. Fixes golang/go#17464 Change-Id: Ic7313433cb21f9a3709d23b50ab58ac1d87957af Reviewed-on: https://go-review.googlesource.com/31187 Reviewed-by: Adam Langley <agl@golang.org> Run-TryBot: Adam Langley <agl@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>