Add extensions from kotlinx.support libraries:

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

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

@@ -0,0 +1,32 @@
+package kotlin.jdk8.collections.test
+
+import org.junit.Test
+import kotlin.test.*
+import java.util.function.Predicate
+import java.util.stream.Collectors
+import kotlin.streams.*
+
+class CollectionTest {
+
+    val data = listOf("abc", "fo", "baar")
+
+    @Test fun stream() {
+        assertEquals(
+                data.flatMap { it.asIterable() },
+                data.stream()
+                        .flatMap { it.chars().boxed().map { it.toChar() } }
+                        .collect(Collectors.toList()))
+
+        assertEquals(data, data.parallelStream().toList())
+    }
+
+
+    @Test fun removeIf() {
+        val coll: MutableCollection<String> = data.toMutableList()
+        assertTrue(coll.removeIf { it.length < 3 })
+        assertEquals(listOf("abc", "baar"), coll as Collection<String>)
+        assertFalse(coll.removeIf(Predicate { it.length > 4 }))
+    }
+
+
+}