[dev.simd] cmd/compile, simd: add 64-bit select-from-pair methods these are in the same style as the 32-bit select-from-pair, including the grouped variant. This does not quite capture the full awesome power of VSHUFPD where it can select differently in each group; that will be some other method, that is more complex. Change-Id: I807ddd7c1256103b5b0d7c5d60bd70b185e3aaf0 Reviewed-on: https://go-review.googlesource.com/c/go/+/705695 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Junyang Shao <shaojunyang@google.com>
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