[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/49_if_complex_expr.sy

@@ -0,0 +1,21 @@
+// Use complex expression in if structure
+int main () {
+    int a;
+    int b;
+    int c;
+    int d;
+    int result;
+    a = 5;
+    b = 5;
+    c = 1;
+    d = -2;
+    result = 2;
+    if ((d * 1 / 2) < 0 || (a - b) != 0 && (c + 3) % 2 != 0) {
+        putint(result);
+    }
+    if ((d % 2 + 67) < 0 || (a - b) != 0 && (c + 2) % 2 != 0) {
+        result = 4;
+        putint(result);
+    }
+    return 0;
+}