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>
5 files changed
tree: 4f6c5e3249f0cc89ccad8b818011a1f4eca1fad1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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