[patch] libstdc++/58265 backport to gcc-5-branch (?)

[Jonathan Wakely]

I've had a request to backport the allocator propagation support for
std::__cxx11::string to the gcc-5-branch. That was done for 6cc-6 by
this patch: https://gcc.gnu.org/ml/gcc-patches/2015-09/msg00784.html

The patch also fixed the fact that moving strings was not noexcept.

Does anyone see any problem with doing that backport to complete the
std::__cxx11::string implementation in gcc-5?

I've already done it locally and confirmed all the tests pass, of
course. The patch for the branch is attached.



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