Make continue work in do-while.

frog/leg/ssa/codegen.dart

Index: frog/leg/ssa/codegen.dart
diff --git a/frog/leg/ssa/codegen.dart b/frog/leg/ssa/codegen.dart
index 0f58f29cd7a6ee9c84bf7f883acd856c5dddfdca..81a7080bce84833540f69824ab931b8aaa0d4f35 100644
--- a/frog/leg/ssa/codegen.dart
+++ b/frog/leg/ssa/codegen.dart
@@ -249,16 +249,21 @@ class SsaCodeGenerator implements HVisitor {
     addIndentation();
     for (LabelElement label in labeledBlockInfo.labels) {
       if (labeledBlockInfo.isContinue) {
-        addContinueLabel(label);
+        if (label.isContinueTarget) {
+          addContinueLabel(label);
+          buffer.add(':');
+        }
       } else {
-        addBreakLabel(label);
+        if (label.isBreakTarget) {
+          addBreakLabel(label);
+          buffer.add(':');
+        }
       }
-      buffer.add(':');
     }
     TargetElement target = labeledBlockInfo.target;
     if (target.isSwitch) {
       addImplicitBreakLabel(target);
-      buffer.add(@':');
+      buffer.add(':');
     }
     if (labeledBlockInfo.isContinue) {
       addImplicitContinueLabel(target);
@@ -297,11 +302,13 @@ class SsaCodeGenerator implements HVisitor {
     }
 
     currentBlock = node;
+
     if (node.isLoopHeader()) {
       // While loop will be closed by the conditional loop-branch.
       // TODO(floitsch): HACK HACK HACK.
       beginLoop(node);
     }
+
     HInstruction instruction = node.first;
     while (instruction != null) {
       if (instruction is HGoto || instruction is HExit || instruction is HTry) {