Do RTL guided ECO on netlist $GOFDIR/examples/ai_eco/imp_net.v
The library is $GOFDIR/examples/ai_eco/art.m.simple2.LIB
The original rtl is $GOFDIR/examples/ai_eco/imp_rtl.sv
The new rtl is $GOFDIR/examples/ai_eco/ref_rtl.sv
The top level module name is testtop
Set test_mode to constant zero
