internal/trace: skip async preempt off tests on low end systems
The OpenBSD armv7 port does not support SMP - on this platform the
trace tests take ~300 seconds to run when async preempt is disabled,
which then times out on the builder. Skip these tests when run in
short mode on a single CPU system.
Change-Id: I9a697d5ba2b20652f76dcc97bd178a4ee8f1a2a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/698555
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Joel Sing <joel@sing.id.au> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>