add: tests for zero-parser.

sysy_sets/32_while_if_test2.sy

@@ -0,0 +1,23 @@
+int ifWhile() {
+  int a;
+  a = 0;
+  int b;
+  b = 3;
+  if (a == 5) {
+    while(b == 2){
+      b = b + 2;
+    }
+    b = b + 25;
+  }
+  else 
+    while (a < 5) {
+      b = b * 2;
+      a = a + 1;
+    }
+  return (b);
+}
+
+
+int main(){
+  return (ifWhile());
+}