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>
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