[Patch] Update string::_M_check/_M_fold

[Paolo Carlini]

Hi,

the below is what I have regtested. I'm quite happy with it!

As often happens for the good ;) clean-ups this one too
uncovered an previously unnoticed sort-of-bug: in append(const
basic_string&, size_type __pos, size_type __n) we were folding
__n and calling reserve accordingly, using an unchecked __pos.

Tested x86-linux, will commit tomorrow morning italian time
if nobody objects.

Paolo.

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