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Avoiding emission of sync processes in RTLIL allows us to avoid a dependency on
matching the behavior expected by Yosys, which generally expects sync processes
in RTLIL to match those emitted by the output from its own Verilog parser.
This also simplifies the logic used in emitting RTLIL overall.
Combinatorial processes are still emitted however. Without these the RTLIL does
not have a high-level understanding of Switch statements, which significantly
diminishes the quality of emitted Verilog, as these are converted to `$mux`
cells in Yosys, which become `?` constructs when converted back to Verilog.