Update submod.cc with -noclean mode #4517
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What are the reasons/motivation for this change?
The
submodpass internally callsopt_cleanto remove any broken wires, etc. When runningsubmodmany times, theopt_cleanpass can become a major speed bottleneck, and it may be possible to run a singleopt_cleanpass at the end to the same effect, eliminating redundant work. This PR adds a-nocleanoption to thesubmodpass so thatopt_cleancan be run at the user's discretion.Explain how this is achieved.
Add a
-nocleanoption tosubmodpass that disables the automatic running of theopt_cleanpass.If applicable, please suggest to reviewers how they can test the change.