CPS implementation of throw and rethrow.

pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart

Index: pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
diff --git a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
index 8ce24823ea3c3a79907a6cb8ba27835c110450f3..766d825d077df2570d201d137576d73491eea18a 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
@@ -435,6 +435,15 @@ class StatementRewriter extends Transformer implements Pass {
     return node;
   }
 
+  Statement visitThrow(Throw node) {
+    node.value = visitExpression(node.value);
+    return node;
+  }
+
+  Statement visitRethrow(Rethrow node) {
+    return node;
+  }
+
   Statement visitBreak(Break node) {
     // Redirect through chain of breaks.
     // Note that useCount was accounted for at visitLabeledStatement.