Continue for simple loops (while/for).

frog/leg/ssa/tracer.dart

Index: frog/leg/ssa/tracer.dart
diff --git a/frog/leg/ssa/tracer.dart b/frog/leg/ssa/tracer.dart
index bfde7508e925c40eff5ef3986ebe33f90091cb3e..c7554460b08e8203eaac5ca1179c98306b01d80a 100644
--- a/frog/leg/ssa/tracer.dart
+++ b/frog/leg/ssa/tracer.dart
@@ -219,6 +219,14 @@ class HInstructionStringifier implements HVisitor<String> {
 
   String visitConstant(HConstant constant) => "Constant ${constant.constant}";
 
+  String visitContinue(HContinue node) {
+    HBasicBlock target = currentBlock.successors[0];
+    if (node.label !== null) {
+      return "Continue ${node.label.labelName}: (B${target.id})";
+    }
+    return "Continue: (B${target.id})";
+  }
+
   String visitDivide(HDivide node) => visitInvokeStatic(node);
 
   String visitEquals(HEquals node) => visitInvokeStatic(node);