Move blackBoxFile() testData to box/ directory

Delete all test methods (and empty test classes), since they'll be
auto-generated

compiler/testData/codegen/box/classes/kt343.kt

@@ -0,0 +1,24 @@
+import java.util.ArrayList
+
+fun launch(f : () -> Unit) {
+    f()
+}
+
+fun box(): String {
+    val list = ArrayList<Int>()
+    val foo : () -> Unit = {
+        list.add(2)  //first exception
+    }
+    foo()
+
+    launch({
+        list.add(3)
+    })
+
+    val bar = {
+        val x = 1   //second exception
+    }
+    bar()
+
+    return if (list.size() == 2 && list.get(0) == 2 && list.get(1) == 3) "OK" else "fail"
+}