cmd/internal/obj/s390x: add VSTRL instruction VSTRL (Vector Store Righmost with Length) instruction is used to store specified number of rightmost bytes of a Vector register into a memory location. This change will add VSTRL into the Go asm for s390x architecture. An upcoming PR of bigmod/nat_s390x.s will use this instruction for performance improvement. Change-Id: I18b5b55025930fda78adb466cc0f26238f73dd6e Reviewed-on: https://go-review.googlesource.com/c/go/+/755520 Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Carlos Amedee <carlos@golang.org> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Srinivas Pokala <Pokala.Srinivas@ibm.com>
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