simd: route HiToLo through Float64x2 and fix codegen tests

Route HiToLo through Float64x2.SetElem/GetElem instead of Uint64x2
to avoid a round-trip through a GP register.

Update simd_arm64.go codegen test for current API.

This is a cherry-pick of CL 787302.

Updates #79899

Change-Id: I3d98bd137474a5188509e5ee365c0d9af386e32c
Reviewed-on: https://go-review.googlesource.com/c/go/+/787303
Reviewed-by: Arseny Samoylov <samoylov.arseny@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
3 files changed
tree: 0c149fee7c95a57d0c1533362fce48d223468568
  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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