[v3, 3.4] Fix libstdc++/21286

[Paolo Carlini]

Hi everyone, hi Gaby,

Ralf Fassel solicitate an action in 3_4-branch too, because this bug is
actually a regression from 3.4.2. Personally, I consider the fix safe,
because this code is generally stable and we had the fix in mainline and
4_0-branch for some time.

Ok?

Thanks,
Paolo.

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