[Patch] Fix fill_n overload signature

[Paolo Carlini]

Hi,

unless I'm missing something subtle, we have got a *very* long standing 
typo in the signature of a fill_n overload. Besides the missed 
optimization issue, due to libstdc++/25304 the problem also leads to 
compilation errors, per the attached testcase.

I will wait until tomorrow evening italian time, then I'd like to apply 
to 4_2-branch too.

Paolo.

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