[v3] libstdc++/51558

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

as far as I can see this version of the fix leads to the best error 
messages: the primary std::hash is complete and consistent besides the 
undefined, but declared, operator and the static_assert (which is 
designed to *always* trigger if the primary is actually instantiated). 
By declaring the operator there are no redundant error messages in 
typical diagnostic outputs *after* the static_assert message.

I'm finishing testing the patch and mean to commit it later today.

Thanks,
Paolo.

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Attachment: CL_51558
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Attachment: patch_51558
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