Revert "allow MODEL to be something other than TestHarness"

This reverts commit bf253aaa97.

csrc/emulator.cc

@@ -65,7 +65,7 @@ int main(int argc, char** argv)
   srand48(random_seed);
 
   Verilated::randReset(2);
-  MODEL *tile = new MODEL;
+  VTestHarness *tile = new VTestHarness;
 
 #if VM_TRACE
   Verilated::traceEverOn(true); // Verilator must compute traced signals

emulator/Makefrag-verilator

@@ -54,7 +54,7 @@ VERILATOR_FLAGS := --top-module $(MODEL) \
   +define+STOP_COND=\$$c\(\"done_reset\"\) --assert \
 	-Wno-STMTDLY --x-assign unique \
   -I$(base_dir)/vsrc \
-  -O3 -CFLAGS "$(CXXFLAGS) -DVERILATOR -include $(base_dir)/csrc/verilator.h -DMODEL=V$(MODEL)"
+  -O3 -CFLAGS "$(CXXFLAGS) -DVERILATOR -include $(base_dir)/csrc/verilator.h"
 cppfiles = $(addprefix $(base_dir)/csrc/, $(addsuffix .cc, $(CXXSRCS)))
 headers = $(wildcard $(base_dir)/csrc/*.h)
 

vsim/Makefrag

@@ -51,7 +51,6 @@ VCS_OPTS = -notice -line +lint=all,noVCDE,noONGS,noUI -error=PCWM-L -timescale=1
 	$(RISCV)/lib/libfesvr.so \
 	-sverilog \
 	+incdir+$(generated_dir) \
-	+define+MODEL=$(MODEL) \
 	+define+CLOCK_PERIOD=1.0 $(sim_vsrcs) $(sim_csrcs) \
 	+define+PRINTF_COND=$(TB).printf_cond \
 	+define+STOP_COND=!$(TB).reset \

vsrc/TestDriver.v

@@ -87,7 +87,7 @@ module TestDriver;
     end
   end
 
-  `MODEL testHarness(
+  TestHarness testHarness(
     .clk(clk),
     .reset(reset),
     .io_success(success)