[v3] Fix libstdc++/54577

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

Hi,

this is the issue about the signatures of the erase member functions of 
the sequence containers. Mostly rather straightfoward stuff within the 
limits of the current infrastructure: the various _M_const_case are 
normally simple enough, I only mention the rather ugly std::vector one, 
required otherwise an ext_pointer testcase fails: I suppose that 
handling these issues in a proper way will happen together with changing 
the vector::pointer typedef to the conforming:

    typedef typename _Alloc_traits::pointer  pointer;

and I suppose Jonathan has the issue "under control". Something similar 
is true for the other containers.

Tested x86_64-linux.

Thanks,
Paolo.

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