This only triggers on ARMv7+.
If there are important SMP ARMv6 machines we can reconsider.

Makes TestLFStress tests pass and sync/atomic tests not time out
on Apple iPad Mini 3.

Fixes #7977.
Fixes #10189.

Change-Id: Ie424dea3765176a377d39746be9aa8265d11bec4
Reviewed-on: https://go-review.googlesource.com/12950Reviewed-by: David Crawshaw <crawshaw@golang.org>