Add extensions from kotlinx.support libraries:

use for AutoCloseables: #KT-5899,
extensions for java.util.Stream.

libraries/stdlib/jre8/test/collections/IterableTest.kt

@@ -0,0 +1,39 @@
+package kotlin.jdk8.collections.test
+
+import org.junit.Test
+import kotlin.test.*
+import java.util.function.*
+
+
+
+class IterableTest {
+
+    val data = listOf("foo", "bar")
+    val iterable = Iterable { data.iterator() }
+
+    @Test fun spliterator() {
+        val spliterator = iterable.spliterator()
+
+        assertEquals(-1, spliterator.exactSizeIfKnown)
+        val expected = data.toMutableList()
+        spliterator.forEachRemaining {
+            assertEquals(expected.removeAt(0), it)
+        }
+    }
+
+    @Test fun forEach() {
+        val expected = data.toMutableList()
+        iterable.forEach(Consumer {
+            assertEquals(expected.removeAt(0), it)
+        })
+    }
+
+    @Test fun forEachRemaining() {
+        val expected = data.toMutableList()
+        val iterator = iterable.iterator()
+        iterator.forEachRemaining(Consumer {
+            assertEquals(expected.removeAt(0), it)
+        })
+    }
+
+}