i915/gem_exec_schedule: Verify that using HW semaphores doesn't block

We may use HW semaphores to schedule nearly-ready work such that they
are already spinning on the GPU waiting for the completion on another
engine. However, we don't want for that spinning task to actually block
any real work should it be scheduled.

v2: No typeof autos
v3: Don't cheat, check gen8 as well

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

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