Fix parameters of perf and test

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Add minor performance improvements

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Add rule to run simulation with work_item_is_world=True on CPU devices (better perfomance)

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Fix ga and pga minor bugs

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>