explictly test codegen with jdk-headers

compiler/testData/codegen/jdk-headers/arrayList.kt

@@ -0,0 +1,13 @@
+import java.util.ArrayList
+
+fun box(): String {
+    val a = ArrayList<Int>()
+    a.add(74)
+    a.add(75)
+    val i: Int = a.get(0)
+    val j: Int = a.get(1)
+    if (i != 74) return "fail 1"
+    if (j != 75) return "fail 2"
+    if (a.size() != 2) return "epic fail"
+    return "OK"
+}