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

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

This one is trivial, as there are already 32-bit AND and OR ops used to
implement the more complex 8-bit versions.

Change-Id: Ic48a53ea291d0067ebeab8e96c82e054daf20ae7
Reviewed-on: https://go-review.googlesource.com/c/go/+/263149
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>