Throw and a small fix to If.

frog/leg/ssa/codegen.dart

 // Copyright (c) 2011, 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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   SsaCodeGeneratorTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA code generator';
 
   String generate(Node tree, HGraph graph) {
     return measure(() {
@@ skipping 233 matching lines @@
 
   visitReturn(HReturn node) {
     buffer.add('return ');
     use(node.inputs[0]);
   }
 
   visitSubtract(HSubtract node) {
     invoke(const SourceString('\$sub'), node.inputs);
   }
 
+  visitThrow(HThrow node) {
+    buffer.add('throw ');
+    use(node.inputs[0]);
+  }
+
   visitTruncatingDivide(HTruncatingDivide node) {
     invoke(const SourceString('\$tdiv'), node.inputs);
   }
 
   void addIndentation() {
     for (int i = 0; i < indent; i++) {
       buffer.add('  ');
     }
   }
 }