[patch] libstdc++/55409 C++11 allocator support for std::list

[Jonathan Wakely]

On 17/06/15 21:36 +0100, Jonathan Wakely wrote:
>I didn't get time to finish this for 5.1, but this adds missing C++11
>allocator support to std::list.

François pointed out that this change means we can update
__gnu_debug::list to derive from an allocator-aware _Safe_sequence.

We can do the same for __cxx11::basic_string by evaluating
bool(_GLIBCXX_USE_CXX11_ABI).

Tested powerpc64-linux, committed to trunk.
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