[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/78_side_effect.sy

@@ -0,0 +1,29 @@
+
+int a = -1, b = 1;
+
+int inc_a()
+{
+    int b = a;
+    b = b + 1;
+    a = b;
+    return a;
+}
+
+int main()
+{
+    int k = 5;
+    while (k >= 0) {
+        if (inc_a() && inc_a() && inc_a()) {
+            putint(a); putch(32); putint(b); putch(10);
+        }
+        if (inc_a() < 14 || inc_a() && inc_a() - inc_a() + 1) {
+            putint(a); putch(10);
+            b = b * 2;
+        } else {
+            inc_a();
+        }
+        k = k - 1;
+    }
+    putint(a); putch(32); putint(b); putch(10);
+    return a;
+}