igt/gem_exec_nop: Add a basic test

Demonstrate how trivial it is to lockup Braswell, at least my N3050 nuc,
by saturating the interrupt handler with a few requests.

References: https://bugs.freedesktop.org/show_bug.cgi?id=93467
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed