[Patch] libstdc++/30449 (fill, fill_n)

[Paolo Carlini]

Hi,

this is the first part of the work, about std::fill and std::fill_n: I'm 
simply closely following the example of std::copy, adding a first step 
to reach the bare pointer of __normal_iterator, thus enabling the 
specialized algorithms exploiting memset/wmemset (for char, unsigned 
char, signed char, and now wchar_t too) also for string::iterators and 
vector::iterators.

Tested x86-linux.

Paolo.

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