runtime/internal/atomic: deduplicate And/Or code on arm
Turns out after adding the generic implementation for And/Or we ended up
with duplicated ops that are exactly the same for arm.
Apologies for the oversight, this CL removes the redundant arm code and
adds arm to the generic build flags.
For #61395
Change-Id: Id5e5a5cf113774948f8e772592e898d0810ad1f6
GitHub-Last-Rev:
4d8c857d15f0267ee0c8bb88a202afd49a6075dc
GitHub-Pull-Request: golang/go#64299
Reviewed-on: https://go-review.googlesource.com/c/go/+/544017
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>