[v3] libstdc++/40925

[Paolo Carlini]

... I also applied this follow-up, to deal correctly with "null
pointers" & move-only types, inspired by:

    http://gcc.gnu.org/ml/libstdc++/2008-10/msg00080.html

I also checked of course that it doesn't break again libstdc++/37919.

Tested x86_64-linux.

Paolo.

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<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37919>
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