Handle switch statement in simple types inferrer.

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library elements;
 
 import 'dart:uri';
 
 import 'modelx.dart';
 import '../tree/tree.dart';
@@ skipping 507 matching lines @@
         && node.arguments.tail.isEmpty;
   }
 
   static bool isGrowableListConstructorCall(Element element,
                                             Send node,
                                             Compiler compiler) {
     return element == compiler.unnamedListConstructor
         && node.isCall
         && node.arguments.isEmpty;
   }
+
+  static bool switchStatementHasContinue(SwitchStatement node,
+                                         TreeElements elements) {
+    for (SwitchCase switchCase in node.cases) {
+      for (Node labelOrCase in switchCase.labelsAndCases) {
+        Node label = labelOrCase.asLabel();
+        if (label != null) {
+          LabelElement labelElement = elements[label];
+          if (labelElement != null && labelElement.isContinueTarget) {
+            return true;
+          }
+        }
+      }
+    }
+    return false;
+  }
+
+  static bool switchStatementHasDefault(SwitchStatement node) {
+    for (SwitchCase switchCase in node.cases) {
+      if (switchCase.isDefaultCase) return true;
+    }
+    return false;
+  }
 }
 
 abstract class ErroneousElement extends Element implements FunctionElement {
   MessageKind get messageKind;
   Map get messageArguments;
 }
 
 abstract class AmbiguousElement extends Element {
   MessageKind get messageKind;
   Map get messageArguments;
@@ skipping 336 matching lines @@
   int get resolutionState;
   Token get beginToken;
   Token get endToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }