implement LabeledStatement and Break in kernel

pkg/compiler/lib/src/ssa/builder.dart

Index: pkg/compiler/lib/src/ssa/builder.dart
diff --git a/pkg/compiler/lib/src/ssa/builder.dart b/pkg/compiler/lib/src/ssa/builder.dart
index 1d158eaf3d4cf111ff0bf5ca9f3c3a778ecb176b..ca155912d60d392a1be3fd79deb2025f2d1fb24c 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -1769,7 +1769,7 @@ class SsaBuilder extends ast.Visitor
         localsHandler =
             savedLocals.mergeMultiple(continueHandlers, conditionBlock);
         SubGraph bodyGraph = new SubGraph(bodyEntryBlock, bodyExitBlock);
-        List<LabelDefinition> labels = jumpHandler.labels();
+        List<LabelDefinition> labels = jumpHandler.labels;
         HSubGraphBlockInformation bodyInfo =
             new HSubGraphBlockInformation(bodyGraph);
         HLabeledBlockInformation info;
@@ -5633,7 +5633,7 @@ class SsaBuilder extends ast.Visitor
       // There was at least one reachable break, so the label is needed.
       entryBlock.setBlockFlow(
           new HLabeledBlockInformation(
-              new HSubGraphBlockInformation(bodyGraph), handler.labels()),
+              new HSubGraphBlockInformation(bodyGraph), handler.labels),
           joinBlock);
     }
     handler.close();
@@ -6079,8 +6079,8 @@ class SsaBuilder extends ast.Visitor
         new HSubExpressionBlockInformation(
             new SubExpression(expressionStart, expressionEnd));
     expressionStart.setBlockFlow(
-        new HSwitchBlockInformation(expressionInfo, statements,
-            jumpHandler.target, jumpHandler.labels()),
+        new HSwitchBlockInformation(
+            expressionInfo, statements, jumpHandler.target, jumpHandler.labels),
         joinBlock);
 
     jumpHandler.close();