Add exception class for simulator bugs

Signed-off-by: Michael Buesch <m@bues.ch>
indir operator: Use AwlSimBug

Signed-off-by: Michael Buesch <m@bues.ch>
cpu-dump: Also dump VL space

Signed-off-by: Michael Buesch <m@bues.ch>
cpu: Improve memory dumping

Signed-off-by: Michael Buesch <m@bues.ch>
Improve FC parameter passing

Signed-off-by: Michael Buesch <m@bues.ch>