Use SmartList for storing annotations in binary classes

Looks like in the most cases there are <= 1 annotations
in real declarations

core/util.runtime/src/org/jetbrains/kotlin/utils/addToStdlib.kt

@@ -130,4 +130,11 @@ inline fun <T> measureTimeMillisWithResult(block: () -> T) : Pair<Long, T> {
     val start = System.currentTimeMillis()
     val result = block()
     return Pair(System.currentTimeMillis() - start, result)
-}
+}
+
+public fun <T> Iterable<Iterable<T>>.flattenTo(c: MutableList<T>): List<T> {
+    for (element in this) {
+        c.addAll(element)
+    }
+    return c
+}