Implement switch statement, without the "complex switch statement" (aka switch statement with conti…

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

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../elements/elements.dart' show JumpTarget, LabelDefinition;
 import '../io/source_information.dart';
 import '../tree/tree.dart' as ast;
 
@@ skipping 342 matching lines @@
 class KernelLoopHandler extends LoopHandler<ir.TreeNode> {
   final KernelSsaBuilder builder;
 
   KernelAstAdapter get astAdapter => builder.astAdapter;
 
   KernelLoopHandler(KernelSsaBuilder builder)
       : this.builder = builder,
         super(builder);
 
   @override
-  JumpHandler createJumpHandler(ir.TreeNode node, {bool isLoopJump}) {
-    if (node.parent is! ir.LabeledStatement) {
-      // No breaks or continues to this node.
-      return new NullJumpHandler(builder.compiler.reporter);
-    }
-    // We must have already created a JumpHandler for the labeled statement
-    JumpHandler result =
-        builder.jumpTargets[astAdapter.getJumpTarget(node.parent)];
-    assert(result != null);
-    return result;
-  }
+  JumpHandler createJumpHandler(ir.TreeNode node, {bool isLoopJump}) =>
+      builder.createJumpHandler(node, isLoopJump: isLoopJump);
 
   @override
   ast.Node getNode(ir.TreeNode node) => astAdapter.getNode(node);
 
   @override
-  JumpTarget getTargetDefinition(ir.TreeNode node) {
-    if (node.parent is ir.LabeledStatement) {
-      return astAdapter.getJumpTarget(node.parent);
-    }
-    return null;
-  }
+  JumpTarget getTargetDefinition(ir.TreeNode node) =>
+      astAdapter.getJumpTarget(node.parent);
 
   @override
   int loopKind(ir.TreeNode node) => node.accept(new _KernelLoopTypeVisitor());
 
   // TODO(het): return the actual source information
   @override
   SourceInformation loopSourceInformation(ir.TreeNode node) => null;
 }
 
 class _KernelLoopTypeVisitor extends ir.Visitor<int> {
@@ skipping 12 matching lines @@
       HLoopBlockInformation.DO_WHILE_LOOP;
 
   @override
   int visitForInStatement(ir.ForInStatement node) =>
       HLoopBlockInformation.FOR_IN_LOOP;
 
   @override
   int visitSwitchStatement(ir.SwitchStatement node) =>
       HLoopBlockInformation.SWITCH_CONTINUE_LOOP;
 }