Avoid emitting addStubs and tearOffCode when not needed.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
index 1ad8c6382e785678ae8fd44d0fc99e78a38d705e..5c19f37d9e7572aaa52c0c320e7b24693a38e5a0 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
@@ -24,6 +24,7 @@ class OldEmitter implements Emitter {
   bool needsClassSupport = false;
   bool needsMixinSupport = false;
   bool needsLazyInitializer = false;
+  bool needsArrayInitializerSupport = false;

[floitsch, 2015/01/06 10:15:13]

Comment what this is.

[zarah, 2015/01/07 08:08:21]

Done.

   final Namer namer;
   ConstantEmitter constantEmitter;
   NativeEmitter get nativeEmitter => task.nativeEmitter;