Add VBROADCASTSD, BROADCASTSS, MOVDDUP, MOVSHDUP, MOVSLDUP,
VMOVDDUP, VMOVSHDUP, VMOVSLDUP.

Fixes #16007

Change-Id: I9614e58eed6c1b6f299d9b4f0b1a7750aa7c1725
Reviewed-on: https://go-review.googlesource.com/31491
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>