Correctly compile unresolved for-in loops.

dart/sdk/lib/_internal/compiler/implementation/compiler.dart

Index: dart/sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/compiler.dart b/dart/sdk/lib/_internal/compiler/implementation/compiler.dart
index a8566268e4d5da685238aa103dc2fed66bc3995c..f89ba742b305a73deb31ef57ff4cf68bcf627708 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -384,6 +384,14 @@ abstract class Compiler implements DiagnosticListener {
   static const SourceString RUNTIME_TYPE = const SourceString('runtimeType');
   static const SourceString START_ROOT_ISOLATE =
       const SourceString('startRootIsolate');
+
+  final Selector iteratorSelector =
+      new Selector.getter(const SourceString('iterator'), null);
+  final Selector currentSelector =
+      new Selector.getter(const SourceString('current'), null);
+  final Selector moveNextSelector =
+      new Selector.call(const SourceString('moveNext'), null, 0);
+
   bool enabledNoSuchMethod = false;
   bool enabledRuntimeType = false;
   bool enabledFunctionApply = false;