[backend]将testdata/下的测例替换为了赛方测试用例，更新了测试脚本

testdata/functional/53_scope2.sy

@@ -0,0 +1,26 @@
+int k;
+
+int main() {
+  k = 3389;
+  if (k < 10000) {
+    k = k + 1;
+    int k = 112;
+    while (k > 10) {
+      k = k - 88;
+      if (k < 1000) {
+        int g = 9;
+        {
+          int l = 11;
+          {
+            g = 10;
+            k = k - g;
+            int g = 11;
+            k = k + g + l;
+          }
+        }
+      }
+    }
+    putint(k);
+  }
+  return k;
+}