Now that for all the relevant backends we do randomised testing, we need
to make sure we still sanity check the obvious cases that might blow up,
such that introducing a temporary regression is less likely.  Also
rather than do this for every backend, just limit to our two memory
types: system and local.
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191025153728.23689-7-chris@chris-wilson.co.uk