std::vector default default and move constructors

[François Dumont]

Hi

 Â Â Â  Here is this patch again, I consider all your remarks and also made 
some changes considering feedback on rbtree patch.

 Â Â Â  * include/bits/stl_vector.h
 Â Â Â  (struct _Vector_base<>::_Vector_impl_data): New.
 Â Â Â  (struct _Vector_base<>::_Vector_impl): Inherit from latter.
 Â Â Â  (_Vector_base<>::_Vector_impl::_M_swap_data): Move...
 Â Â Â  (_Vector_base<>::_Vector_impl_data::_M_swap_data): ...here.
 Â Â Â  (_Vector_base<>::_Vector_impl()): Add noexcept qualification.
 Â Â Â  (_Vector_base<>::_Vector_impl(_Vector_impl&&)): New.
 Â Â Â  (_Vector_base<>::_Vector_impl(_Tp_alloc_type&&, _Vector_impl&&)): New.
 Â Â Â  (_Vector_base(const allocator_type&, _Vector_base&&)): New, use latter.
 Â Â Â  (_Vector_base()): Default.
 Â Â Â  (_Vector_base(_Vector_base&&)): Default.
 Â Â Â  (_Vector_base(size_t)) [_GLIBCXX_INLINE_VERSION]: Delete.
 Â Â Â  (_Vector_base(_Tp_alloc_type&&)) [_GLIBCXX_INLINE_VERSION]: Delete.
 Â Â Â  (_Vector_base::_M_create_storage(size_t)): Make protected.
 Â Â Â  (vector()): Default.
 Â Â Â  (vector(vector&&)): Default.
 Â Â Â  (vector(vector&&, const allocator_type&, true_type)): New.
 Â Â Â  (vector(vector&&, const allocator_type&, false_type)): New.
 Â Â Â  (vector(vector&&, const allocator_type&)): Use latters.
 Â Â Â  (vector(_InputIte, _InputIte, const allocator_type&)): Call
 Â Â Â  _M_range_initialize directly.
 Â Â Â  * testsuite/23_containers/vector/allocator/default_init.cc: New.
 Â Â Â  * testsuite/23_containers/vector/cons/noexcept_move_construct.cc: Add
 Â Â Â  static assertions.

 Â Â Â  Tested under Linux x86_64, normal and debug modes.

Ok to commit ?

François
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