Handle for-loop with simple break in compile_from_dill_test

pkg/compiler/lib/src/elements/modelx.dart

Index: pkg/compiler/lib/src/elements/modelx.dart
diff --git a/pkg/compiler/lib/src/elements/modelx.dart b/pkg/compiler/lib/src/elements/modelx.dart
index 7d2258dd8042219d214961904a0ed3eb85bee675..1bc21b84ed7fd168b35dc9d3e152d7121794b56a 100644
--- a/pkg/compiler/lib/src/elements/modelx.dart
+++ b/pkg/compiler/lib/src/elements/modelx.dart
@@ -3337,7 +3337,7 @@ class UnnamedMixinApplicationElementX extends MixinApplicationElementX {
   bool get isAbstract => true;
 }
 
-class LabelDefinitionX implements LabelDefinition<Node> {
+class LabelDefinitionX extends LabelDefinition<Node> {
   final Label label;
   final String labelName;
   final JumpTargetX target;
@@ -3362,12 +3362,10 @@ class LabelDefinitionX implements LabelDefinition<Node> {
     target.isContinueTarget = true;
   }
 
-  bool get isTarget => isBreakTarget || isContinueTarget;
-
   String toString() => 'Label:${name}';
 }
 
-class JumpTargetX implements JumpTarget<Node> {
+class JumpTargetX extends JumpTarget<Node> {
   final ExecutableElement executableContext;
   final Node statement;
   final int nestingLevel;
@@ -3382,10 +3380,6 @@ class JumpTargetX implements JumpTarget<Node> {
   @override
   MemberElement get memberContext => executableContext.memberContext;
 
-  String get name => "target";
-
-  bool get isTarget => isBreakTarget || isContinueTarget;
-
   LabelDefinition<Node> addLabel(Label label, String labelName,
       {bool isBreakTarget: false}) {
     LabelDefinitionX result = new LabelDefinitionX(label, labelName, this);