[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/84_long_array2.sy

@@ -0,0 +1,19 @@
+int a[4096];
+
+int f1(int b[])
+{
+    a[5] = 4000;
+    a[4000] = 3;
+    a[4095] = 7;
+    b[a[4095]] = a[2216] + 9;
+    return a[a[5]];
+}
+
+int main()
+{
+    int b[4][1024] = {{}, {1}, {2, 3}, {4, 5, 6}};
+    int c[1024][4] = {{1, 2}, {3, 4}};
+    putint(f1(c[0]));
+    putch(10);
+    return c[2][0];
+}