runtime/internal/atomic: add ppc64x operators for And/Or
These primitives will be used by the new And/Or sync/atomic apis.
For #61395
Change-Id: I9ad92634add0357092e49b5a4a40c177e242a0b6
GitHub-Last-Rev:
cf3fb0dce6a462b5d63fe8fe974573ab86df0b66
GitHub-Pull-Request: golang/go#63294
Reviewed-on: https://go-review.googlesource.com/c/go/+/531716
Reviewed-by: Eli Bendersky <eliben@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Paul Murphy <murp@ibm.com>