Fix vector C++11 allocator bug

[François Dumont]

On 03/07/2013 11:46 PM, Jonathan Wakely wrote:
> As expected it works for vector/swap.cc too. So we definitely need the 
> bug fix to std::vector::operator= and the testsuite changes to add 
> elements, but I think I'd prefer to just re-swap the containers in the 
> non-propagating case. 

This is indeed better so I applied the patch as you proposed.

2013-03-08  François Dumont  <fdumont@gcc.gnu.org>

     * include/bits/vector.tcc (vector<>operator=(const vector<>&):
     Reset pointers after deallocation when memory can be reused.
     * testsuite/23_containers/vector/allocator/minimal.cc: Insert
     elements to really challenge C++11 allocator integration.
     * testsuite/23_containers/vector/allocator/copy.cc: Likewise.
     * testsuite/23_containers/vector/allocator/copy_assign.cc:
     Likewise.
     * testsuite/23_containers/vector/allocator/move_assign.cc:
     Likewise.
     * testsuite/23_containers/vector/allocator/swap.cc: Likewise and
     swap vector back before checks on memory/personality mapping are
     performed.
     * testsuite/23_containers/forward_list/allocator/minimal.cc:
     Insert element to really challenge C++11 allocator integration.
     * testsuite/23_containers/forward_list/allocator/copy.cc:
     Likewise.
     * testsuite/23_containers/forward_list/allocator/copy_assign.cc:
     Likewise.
     * testsuite/23_containers/forward_list/allocator/move_assign.cc:
     Likewise.
     * testsuite/23_containers/forward_list/allocator/swap.cc: Likewise
     and swap forward_list back before checks on memory/personality
     mapping are performed.

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