Manually inline fixed-size list's forEach, to make it possible for the VM to optimize.

runtime/lib/array.dart

Index: runtime/lib/array.dart
diff --git a/runtime/lib/array.dart b/runtime/lib/array.dart
index a24e404db02a382ea323e9119bec2f350d28cdcc..e12344868e3061b4695906c00458629a8fb01cbd 100644
--- a/runtime/lib/array.dart
+++ b/runtime/lib/array.dart
@@ -117,7 +117,9 @@ class _List<E> implements List<E> {
   }
 
   void forEach(f(E element)) {
-    IterableMixinWorkaround.forEach(this, f);
+    for (int i = 0; i < length; i++) {

[kasperl, 2014/08/28 13:45:18]

Does it make a difference if you cache length in a local variable for
unoptimized code?

[Anders Johnsen, 2014/08/28 14:20:12]

Done.

+      f(this[i]);
+    }
   }
 
   String join([String separator = ""]) {