[Patch] Fix libstdc++/14245

[Paolo Carlini]

Hi,

after a little bit of struggle ;), I came to the conclusion that
submitter is right. In a nut shell, besides technical points about
sophisticated allocators, the issue is that we should always pass to
_Rep::_M_grab as its first argument the allocator actually used by
the string, otherwise, _S_create (called by _M_clone) may end up
allocating memory via an allocator different from that of the string:
no good.

Tested x86-linux. If nobody objects, will commit early tomorrow to
mainline.

Paolo.

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