runtime: use native CAS and memory barrier on ARMv7
This gets us around the kernel helpers on ARMv7. It is slightly faster than using the kernel helper. name old time/op new time/op delta AtomicLoad-4 72.5ns ± 0% 69.5ns ± 0% -4.08% (p=0.000 n=9+9) AtomicStore-4 57.6ns ± 1% 54.4ns ± 0% -5.58% (p=0.000 n=10+9) [Geo mean] 64.6ns 61.5ns -4.83% If performance is really critical, we can even do compiler intrinsics on GOARM=7. Fixes #23792. Change-Id: I36497d880890b26bdf01e048b542bd5fd7b17d23 Reviewed-on: https://go-review.googlesource.com/94076 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Austin Clements <austin@google.com>
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