Fix netlist creation when code contains concurrent assertions

[udif]

This is the beginning of a PR to fix #1002 . It works for a simple testcase that fails otherwise, but I still see different failures (DirectedGraph issue, might be unrelated) when reading larger examples such as those provided in #1002, so I don't think it is ready yet, but it's a start and it can be reviewed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.70%. Comparing base (07b7d65) to head (36bea5a). Report is 3 commits behind head on master.

Additional details and impacted files

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[MikePopoloski]

What's the status of this PR?

[udif]

I apologize, after being blocked by #1007 I forgot about this, thanks for reminding me. I will have to rebase it on the new Netlist code. It will take me a few more days.

[udif]

I think it is OK now.