simd: for 1.27, make ARM64 Reduce* methods return scalar This is a cherry pick of Alexander Musman's CL 784800, done this way to help with 1.27 release deadlines and a minor amount of merging friction. ReduceSum/ReduceMax/ReduceMin on all types now return scalar (e.g. int32) instead of vector. Internally, the intrinsics are unexported (lowercase) and return a vector with the result in lane 0. The exported wrappers call GetElem(0) to extract the scalar, generated by tmplgen. A follow-up CL will add peephole rules to elide the GetElem(0) when the result feeds directly into another SIMD operation. Former-Change-Id: I630cec6a26d54ed9ed1412a37076e20df9e51038 Change-Id: Id8ff6e07083bc62de4ca595dea3c9884b75ec517 Reviewed-on: https://go-review.googlesource.com/c/go/+/787560 LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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