A new test for alt-headers

compiler/testData/diagnostics/tests/alt-headers/ArrayListAndMap.jet

@@ -0,0 +1,34 @@
+// +JDK
+
+package std1
+
+import java.util.*
+
+fun main(args : Array<String>) {
+    val al : ArrayList<Int> = ArrayList<Int>
+    val al1 = ArrayList<Int>(1)
+//    for (x in al1) {
+//
+//    }
+    val <!UNUSED_VARIABLE!>al2<!> = ArrayList<Int>(ArrayList<Int>)
+    al : RandomAccess
+    al.clear() : Unit
+    al.add(1) : Boolean
+    al.add(0, 1) : Unit
+    al.addAll(al1) : Boolean
+    al.addAll(0, al1) : Boolean
+    al.get(0) : Int
+    al.clone() : Object // A type mismatch on this line means that alt-headers were not loaded
+    al.toArray(Array<Int>(3, {1})) : Array<Int> // ^^^ same for this line
+    val m = HashMap<String, Int>()
+    m.put("", 1)
+    test(al, m)
+}
+fun test(a : List<Int>, m : Map<String, Int>) {
+  System.out?.println(
+    a.get(0) + 1
+  )
+  HashMap<Int, Int>().get(0)
+  if (m.get("") != null)
+  System.out?.println(m.get("").sure().plus(1))
+}