cmd/compile: intrinsify runtime/internal/atomic.{And,Or} on ARM64

cmd/compile: intrinsify runtime/internal/atomic.{And,Or} on ARM64

These are identical to And8 and Or8, just using LDAXRW/STLXRW instead of
LDAXRB/STLXRB.

Change-Id: I5308832ae165064550bee4bb245809ab952f4cc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/263148
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>