CPS implementation of throw and rethrow.

pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
index c67b2b58f287aec8466755c4a07e8ed16e0fc5f9..5a61847b2ab96b6e82932635187de65338da68b6 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_builder.dart
@@ -453,6 +453,19 @@ class Builder implements cps_ir.Visitor<Node> {
     return continueWithExpression(node.continuation, concat);
   }
 
+  Statement visitThrow(cps_ir.Throw node) {
+    Expression value = getVariableUse(node.value);
+    return new Throw(value);
+  }
+
+  Statement visitRethrow(cps_ir.Rethrow node) {
+    return new Rethrow();
+  }
+
+  Expression visitNonTailThrow(cps_ir.NonTailThrow node) {
+    unexpectedNode(node);
+  }
+
   Statement continueWithExpression(cps_ir.Reference continuation,
                                    Expression expression) {
     cps_ir.Continuation cont = continuation.definition;