libc++: First cut at <dynarray>

[Marshall Clow]

<dynarray> See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3662.html

Open Issues:
1) This includes <tuple> because that's where __uses_alloc_ctor lives. I'm thinking that __uses_alloc_ctor should be hoisted into a common header. Maybe __functional_base.

2) This includes a general implementation of user-allocator construction (named __user_alloc_construct). This should probably be hoisted as well; and possibly the code in scoped_allocator can be reworked to use it (if it simplifies things).

3) There's no support for stack allocations at present; that requires compiler support. I'm working with some people on getting that into clang.

4) There's an awful lot of duplication in the (many, many) constructors.

-- 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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