machxo2: Hardcode a rule for emitting U_/D_ or G_ prefixes in ASCII output.
machxo2: Hardcode a rule for emitting U_/D_ or G_ prefixes in ASCII output.

SymbiFlow/nextpnr,SymbiFlow/nextpnr,YosysHQ/nextpnr,SymbiFlow/nextpnr,YosysHQ/nextpnr,YosysHQ/nextpnr,SymbiFlow/nextpnr,YosysHQ/nextpnr