Provide deprecated AbstractIterator in the old package kotlin.support.

libraries/stdlib/src/kotlin/collections/AbstractIteratorDeprecated.kt

@@ -0,0 +1,8 @@
+package kotlin.support
+
+/**
+ * A base class to simplify implementing iterators so that implementations only have to implement [computeNext]
+ * to implement the iterator, calling [done] when the iteration is complete.
+ */
+@Deprecated("Use AbstractIterator from kotlin.collections instead.", ReplaceWith("kotlin.collections.AbstractIterator<T>"))
+public abstract class AbstractIterator<T> : kotlin.collections.AbstractIterator<T>()