Fix rewriter to not treat throw as an expression.

src/rewriter.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 93 matching lines @@
   // a variable declaration with initialization expression is 'undefined'
   // with some JS VMs: For instance, using smjs, print(eval('var x = 7'))
   // returns 'undefined'. To obtain the same behavior with v8, we need
   // to prevent rewriting in that case.
   if (!node->is_initializer_block()) Process(node->statements());
 }
 
 
 void Processor::VisitExpressionStatement(ExpressionStatement* node) {
   // Rewrite : <x>; -> .result = <x>;
-  if (!is_set_) {
+  if (!is_set_ && !node->expression()->IsThrow()) {
     node->set_expression(SetResult(node->expression()));
     if (!in_try_) is_set_ = true;
   }
 }
 
 
 void Processor::VisitIfStatement(IfStatement* node) {
   // Rewrite both then and else parts (reversed).
   bool save = is_set_;
   Visit(node->else_statement());
@@ skipping 139 matching lines @@
       result_statement->set_statement_pos(position);
       body->Add(result_statement);
     }
   }
 
   return true;
 }
 
 
 } }  // namespace v8::internal