dart2js cps: Logical rewriter should treat Throw as a terminator.

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

 // Copyright (c) 2014, 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.
 
 library tree_ir.optimization.logical_rewriter;
 
 import '../tree_ir_nodes.dart';
 import 'optimization.dart' show Pass;
 import '../../constants/values.dart' as values;
 
@@ skipping 77 matching lines @@
     return node.target.binding == target ||
            target is Continue && target.target == node.target;
   }
 
   bool isFallthroughReturn(Return node) {
     return isNull(node.value) && fallthrough.target == null;
   }
 
   bool isTerminator(Statement node) {
     return (node is Jump || node is Return) && !isFallthrough(node) ||
-           (node is ExpressionStatement && node.next is Unreachable);
+           (node is ExpressionStatement && node.next is Unreachable) ||
+           node is Throw;
   }
 
   Statement visitIf(If node) {
     // If one of the branches is empty (i.e. just a fallthrough), then that
     // branch should preferably be the 'else' so we won't have to print it.
     // In other words, we wish to perform this rewrite:
     //   if (E) {} else {S}
     //     ==>
     //   if (!E) {S}
     // In the tree language, empty statements do not exist yet, so we must check
@@ skipping 436 matching lines @@
       return e2 is VariableUse && e1.variable == e2.variable;
     }
     return false;
   }
 
   void destroyVariableUse(VariableUse node) {
     --node.variable.readCount;
   }
 }