Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/regressions/Kt2495Test.kt

@@ -0,0 +1,17 @@
+// WITH_RUNTIME
+
+package regressions
+
+fun f(xs: Iterator<Int>): Int {
+    var answer = 0
+    for (x in xs)  {
+        answer += x
+    }
+    return answer
+}
+
+fun box(): String {
+    val list = arrayListOf(1, 2, 3)
+    val result = f(list.iterator())
+    return if (6 == result) "OK" else "fail"
+}