igt/gem_exec_parse: Simple exercise for MI_LOAD_REGISTER_REG

Command parser version 7 introduces the ability to copy between
regsiters from the Haswell RCS with MI_LOAD_REGISTER_REG. This provides
a quick smoketest of that ability.

v2: Add some negative tests as well

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed