passes: allow multiple load of passes

We have only few passes that cannot be loaded more that once.
Add flag that says: don't load this pass multiple times and
allow all the other passes to be loaded multiple times.

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
interactive: allow load only once

do not load this pass more than once

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>