In-place reversing.

#KT-9034

libraries/stdlib/src/generated/_Collections.kt

@@ -789,6 +789,13 @@ public inline fun <T> Iterable<T>.takeWhile(predicate: (T) -> Boolean): List<T>
     return list
 }
 
+/**
+ * Reverses elements in the collection in-place.
+ */
+public fun <T> MutableList<T>.reverse(): Unit {
+    java.util.Collections.reverse(this)
+}
+
 /**
  * Returns a list with elements in reversed order.
  */