Fix init: access non-init in run test

```Scala
-- Error: tests/run/tuples1.scala:28:27 ----------------------------------------
28 |  val c0_1 = x0 ++ x1; val c0_1c: Int *: Unit = c0_1c; println(s"c0_1 = $c0_1")
   |                           ^
   |Access non-initialized field value c0_1c. Calling trace:
   | -> val c0_1 = x0 ++ x1; val c0_1c: Int *: Unit = c0_1c; println(s"c0_1 = $c0_1")	[ tuples1.scala:28 ]
-- Error: tests/run/tuples1.scala:29:27 ----------------------------------------
29 |  val c1_0 = x1 ++ x0; val c1_0c: Int *: Unit = c1_0c; println(s"c1_0 = $c1_0")
   |                           ^
   |Access non-initialized field value c1_0c. Calling trace:
   | -> val c1_0 = x1 ++ x0; val c1_0c: Int *: Unit = c1_0c; println(s"c1_0 = $c1_0")	[ tuples1.scala:29 ]
```

Author: liufengyun

tests/run/tuples1.scala

@@ -25,8 +25,8 @@ object Test extends App {
   val a6_4 = x6(4); val a6_4c: String = a6_4; println(s"a6_4 = $a6_4")
   val a8_0 = x8(0); val a8_0c: String = a8_0; println(s"a8_0 = $a8_0")
   val c0_0 = x0 ++ x0; val c0_0c: Unit = c0_0; println(s"c0_0 = $c0_0")
-  val c0_1 = x0 ++ x1; val c0_1c: Int *: Unit = c0_1c; println(s"c0_1 = $c0_1")
-  val c1_0 = x1 ++ x0; val c1_0c: Int *: Unit = c1_0c; println(s"c1_0 = $c1_0")
+  val c0_1 = x0 ++ x1; val c0_1c: Int *: Unit = c0_1; println(s"c0_1 = $c0_1")
+  val c1_0 = x1 ++ x0; val c1_0c: Int *: Unit = c1_0; println(s"c1_0 = $c1_0")
   val c0_4 = x0 ++ x4; val c0_4c: (String, Int, String, Int) = c0_4; println(s"c0_4 = $c0_4")
   val c4_0 = x4 ++ x0; val c4_0c: (String, Int, String, Int) = c4_0; println(s"c4_0 = $c4_0")
   val c1_1 = x1 ++ x1; val c1_1c: (Int, Int) = c1_1; println(s"c1_1 = $c1_1")