internal/bytealg: port bytealg functions to reg ABI on s390x
This adds support for the reg ABI to the byte/string functions for
s390x. These are initially under control of the GOEXPERIMENT
macro until all changes are in.
Updates #40724
Change-Id: Ia3532523fe3a839cc0370d6fe1544972327be514
Reviewed-on: https://go-review.googlesource.com/c/go/+/719481 Reviewed-by: Vishwanatha HD <vishwanatha.hd@ibm.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@golang.org>