[Patch] Fix libstdc++/16956

[Paolo Carlini]

Paolo Carlini wrote:

> Therefore, I'm finally coming to the conclusion that we have "just" a 
> serious bug: I'm preparing a variant
> of submitter patch + testcases, which will post soon.

This is the actual patch, already tested x86-linux. Interestingly, the 
current code is quite a bit cleaner than
the buggy one, thanks to __off added once and for all at beginning.

If nobody objects will commit to mainline this evening.

Paolo.

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