backport: As described in http://gcc.gnu.org/ml/gcc... 2012-08-14 Diego Novillo <dnovillo@google.com> 2012-08-14 Diego Novillo <dnovillo@google.com> 2012-08-14 Diego Novillo <dnovillo@google.com> 2012-08-14 Diego Novillo <dnovillo@google.com> 2012-08-14 Diego Novillo <dnovillo@google.com> 2012-08-14 Diego Novillo <dnovillo@google.com> 2012-08-14 Diego Novillo <dnovillo@google.com>