[backend] introduced riscv64

src/sysyc.cpp

@@ -10,7 +10,7 @@ using namespace antlr4;
 #include "SysYIRGenerator.h"
 #include "SysYIRPrinter.h"
 #include "SysYIROptPre.h"
-#include "RISCv32Backend.h"
+#include "RISCv64Backend.h"
 // #include "LLVMIRGenerator.h"
 using namespace sysy;
 
@@ -88,7 +88,7 @@ int main(int argc, char **argv) {
 
   // generate assembly
   auto module = generator.get();
-  sysy::RISCv32CodeGen codegen(module);
+  sysy::RISCv64CodeGen codegen(module);
   string asmCode = codegen.code_gen();
   if (argStopAfter == "asm") {
     cout << asmCode << endl;