libc++: implement uses-allocator construction

[Marshall Clow]

Split out from <dynarray>.
Section 20.8.7.2 (at least in N3691)

Howard wrote:

> However when I just now tried to do so, I created circular header dependencies.  After investigating further, adding <new> to <__functional_base> isn't so bad.  Everything <new> includes is already included by <__functional_base>.  So <__functional_base> only swells by the immediate contents of <new> which is pretty small.
> 
> In summary, my suggestion is:
> 
> *  Add #include <new> to <__functional_base>
> 
> *  Move allocator_arg_t, __uses_alloc_ctor, __user_alloc_construct to <__functional_base>.

and then:

> __user_alloc_construct and __user_alloc_construct_impl needs decoration with inline _LIBCPP_INLINE_VISIBILITY.
> 
> Case 0 of __user_alloc_construct_impl, remove unused argument name "__a".

Did all that :-)

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

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