A few more test cases that are measurably unreliable when run in SMP.
For the most part these work most of the time (though the semaphore
one was pretty borderline -- I measured about 25% failures), but are
measurably unstable against the backdrop of known qemu instability.
Something is clearly going on and we need to come back to these to fix
threadsafety issues.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
4f04f6486d