Robust and rationalized pass-through removal. #4001
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Phi input ordering is preserved by explicitly recording the states in which an input is selected by the phi for a parameter in ContinuationInput::choose_in_states. This is filled in using an initial FSM layout on the unoptimized continuation graph. Then, after optimization, the choose_in_states field is used to fill back in NewFSMState::current_inputs_by_input_param. PiperOrigin-RevId: 894119622
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Robust and rationalized pass-through removal.
Phi input ordering is preserved by explicitly recording the states in which
an input is selected by the phi for a parameter in ContinuationInput::choose_in_states.
This is filled in using an initial FSM layout on the unoptimized continuation graph. Then, after optimization, the choose_in_states field is used to fill back in NewFSMState::current_inputs_by_input_param.