r600/sfn: fix nop channel assignment.
I'm not sure this is correct for evergreen, maybe it needs to be cayman specific, it at least fixes a bunch of tests assering that it can't assign alu slots
Fixes #2993 (closed)
I'm not sure this is correct for evergreen, maybe it needs to be cayman specific, it at least fixes a bunch of tests assering that it can't assign alu slots
Fixes #2993 (closed)