Initial commit from sysy-main

test/24_test_cp_cf.sy

@@ -0,0 +1,14 @@
+//test file for constant propogation (cp) and constant folding (cf)
+int main(){
+
+   int b = 5;
+   int c = 4 * b;
+   int d, g;
+
+   if(c > 8){
+        d = b + c;
+   }
+   g = c * d;
+   
+   return g;
+}