dart2js: Recanonicalize selectors in static fields between runs.

pkg/compiler/lib/src/common/names.dart

Index: pkg/compiler/lib/src/common/names.dart
diff --git a/pkg/compiler/lib/src/common/names.dart b/pkg/compiler/lib/src/common/names.dart
index fa1812ced1dfde40040c03606acad5628de0be05..657cc6fbe23438752d32f9d8e8a6f69d59949d9f 100644
--- a/pkg/compiler/lib/src/common/names.dart
+++ b/pkg/compiler/lib/src/common/names.dart
@@ -108,6 +108,14 @@ class Selectors {
   static final Selector equals = new Selector.binaryOperator('==');
 
   static final Selector length = new Selector.getter(Names.length);
+
+  /// List of all the selectors held in static fields.
+  ///
+  /// These objects are shared between different runs in batch-mode and must
+  /// thus remain in the [Selector.canonicalizedValues] map.
+  static final List<Selector> ALL = <Selector>[
+      cancel, current, iterator, moveNext, noSuchMethod_, toString_,
+      hashCode_, compareTo, equals, length];
 }
 
 /// [Uri]s commonly used.