[v3] Fix libstdc++/50268

[Paolo Carlini]

Hi,

tested x86_64-linux multilib, will go in 4_6-branch too.

See audit trail for details: in short when std::bitset has been updated 
for constexpr, thus the constructor from unsigned long long marked as 
such, the call to _M_do_sanitize in the body was inadvertently 
completely removed without replacing it with something else compatible 
with constexpr.

Thanks,
Paolo.

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