Add a whitelist for functions that we always want to inline.

sdk/lib/internal/iterable.dart

Index: sdk/lib/internal/iterable.dart
diff --git a/sdk/lib/internal/iterable.dart b/sdk/lib/internal/iterable.dart
index 006b31acb6fef4ee6860799d8135c2c10c6b1cfe..8edb77909bcf08579ce9bfd10e83b860be1631d9 100644
--- a/sdk/lib/internal/iterable.dart
+++ b/sdk/lib/internal/iterable.dart
@@ -318,13 +318,15 @@ class ListIterator<E> implements Iterator<E> {
     if (_length != length) {
       throw new ConcurrentModificationError(_iterable);
     }
+    bool result = false;
     if (_index >= length) {
       _current = null;
-      return false;
+    } else {
+      _current = _iterable.elementAt(_index);
+      _index++;
+      result = true;
     }
-    _current = _iterable.elementAt(_index);
-    _index++;
-    return true;
+    return result;
   }
 }