[patch] Implement std::make_unique

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

        * include/bits/unique_ptr.h (make_unique): Define.
        * testsuite/20_util/unique_ptr/creation/single.cc: New.
        * testsuite/20_util/unique_ptr/creation/array.cc: New.
        * testsuite/20_util/unique_ptr/creation/array_neg.cc: New.

Tested x86_64-linux, committed to trunk.

This is safe for 4.8.2 so I'll commit it there once the branch reopens.

It might even be nice to provide this for C++11, maybe when using
-std=gnu++11 not -std=c++11, or by putting the declarations in
namespace std::__cxx14, which is inline in C++14 but not in C++11
mode.

Attachment: patch.txt
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