runtime: execute TestSpuriousWakeupsNeverHangSemasleep in parallel
This test spends most of its time sleeping and waiting on a subprocess
to sleep. It seems like a prime candidate to run in parallel, although
we may need to relax its hard-coded 2s timeout on the sleep(1)
subprocess.
For #48770
Change-Id: I4e839739fe82446615f9894c1904c87e5f3cf386
Reviewed-on: https://go-review.googlesource.com/c/go/+/366256
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com> Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>