If there are no opcodes then just delete the code space.
If there are no opcodes then just delete the code space.

If there are no opcodes then the various checks access an undefined
opcode, so just delete the code space for this case.

CastMi/iverilog,themperek/iverilog,themperek/iverilog,CastMi/iverilog,themperek/iverilog,CastMi/iverilog