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[FIRRTL] Properly handle InstanceChoice in IMCP #9701

@uenoku

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@uenoku

Currently instance results and ports referred from InstanceChoice op are marked overdefined pessimistically.
Technically it's allowed to propagate constant through instance choice as long as lattice states are merged properly.

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    FIRRTLInvolving the `firrtl` dialectenhancementNew feature or request

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