Implement continue for switch.

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

Index: sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart b/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
index 592dfa1b67ed01b83ac272355212b62baf56aa58..352e3719471bd8b720a002fe5e5542603be948a2 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
@@ -1673,7 +1673,7 @@ class HBitNot extends HInvokeUnary {
     instructionType = HType.INTEGER;
   }
   accept(HVisitor visitor) => visitor.visitBitNot(this);
-  
+
   UnaryOperation operation(ConstantSystem constantSystem)
       => constantSystem.bitNot;
   int typeCode() => HInstruction.BIT_NOT_TYPECODE;
@@ -1702,8 +1702,16 @@ abstract class HJump extends HControlFlow {
 }
 
 class HBreak extends HJump {
-  HBreak(TargetElement target) : super(target);
-  HBreak.toLabel(LabelElement label) : super.toLabel(label);
+  /**
+   * Signals that this is a special break instruction for the synthetic loop
+   * generatedfor a switch statement with continue statements. See
+   * [SsaBuilder.buildComplexSwitchStatement] for detail.
+   */
+  final bool breakSwitchContinueLoop;
+  HBreak(TargetElement target, {bool this.breakSwitchContinueLoop: false})
+      : super(target);
+  HBreak.toLabel(LabelElement label)
+      : breakSwitchContinueLoop = false, super.toLabel(label);
   toString() => (label != null) ? 'break ${label.labelName}' : 'break';
   accept(HVisitor visitor) => visitor.visitBreak(this);
 }
@@ -2468,6 +2476,8 @@ class LoopTypeVisitor extends Visitor {
   int visitFor(For node) => HLoopBlockInformation.FOR_LOOP;
   int visitDoWhile(DoWhile node) => HLoopBlockInformation.DO_WHILE_LOOP;
   int visitForIn(ForIn node) => HLoopBlockInformation.FOR_IN_LOOP;
+  int visitSwitchStatement(SwitchStatement node) =>
+      HLoopBlockInformation.SWITCH_CONTINUE_LOOP;
 }
 
 class HLoopBlockInformation implements HStatementInformation {
@@ -2475,6 +2485,7 @@ class HLoopBlockInformation implements HStatementInformation {
   static const int FOR_LOOP = 1;
   static const int DO_WHILE_LOOP = 2;
   static const int FOR_IN_LOOP = 3;
+  static const int SWITCH_CONTINUE_LOOP = 4;
   static const int NOT_A_LOOP = -1;
 
   final int kind;