[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/54_hidden_var.sy

@@ -0,0 +1,54 @@
+
+int b = 5;
+int c[4] = {6, 7, 8, 9};
+
+int main()
+{
+    int a;
+    a = 1;
+    {
+        int a;
+        a = 2;
+        {
+            a = 3;
+            putint(a);
+        }
+        putint(a);
+    }
+    putint(a); putch(10);
+
+    while (a < 5) {
+        int a = 0;
+        a = a + 1;
+        if (a)
+            break;
+    }
+    putint(a); putch(10);
+
+    {
+        {
+            {
+                {}
+            }
+            c[2] = 1;
+            {
+                int c[2][8] = {{0, 9}, 8, 3};
+            }
+        }
+    }
+
+    {
+        int b = 2;
+        if (c[2]) {
+            int c[7][1][5] = {{}, {}, {2, 1, 8}, {{}}};
+            putint(c[b][0][0]);
+            putint(c[b][0][1]);
+            putint(c[b][0][2]);
+        }
+    }
+    putch(10);
+
+    putint(b); putch(10);
+    putint(c[0]); putint(c[1]); putint(c[2]); putint(c[3]); putch(10);
+    return 0;
+}