processSsa abstract method
Given existing currentMappings, connects drivers and receivers
accordingly to SsaLogics and returns an updated set of mappings.
This function may add new Conditionals to existing Conditionals.
This is used for Combinational.ssa.
Implementation
@protected
@visibleForOverriding
Map<Logic, Logic> processSsa(Map<Logic, Logic> currentMappings,
{required int context});