[PATCH] Move allocator in std::string and RB tree move constructors

[Jonathan Wakely]

On 22/07/16 16:06 +0100, Jonathan Wakely wrote:
>The move constructors for strings and RB trees were not move
>constructing the allocator.
>
>	PR libstdc++/71964
>	* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI]
>	(basic_string::_Alloc_hider(pointer, _Alloc&&)): Add constructor.

This new constructor adds a new symbol, which needs a new symbol
version (so the abi-check is failing currently).

I'll update the baselines and add that new version, and then I can
also un-revert the basic_string::allocator_type::pointer changes I did
recently.