[Patch] Fix to random_access overload of std::reverse

[Chris Jefferson]

This is a (hopefully) simple patch the overload of std::reverse in the 
random-access case.

Firstly the comment on the function is wrong because it refers to 
bidirectional iterators.

Secondly, the existing version has two main problems. It needlessly uses 
a post-increment, and also when the given vector is of odd length it 
swaps the middle element with itself, which I suspect violates the 
standard on this issue. This patch fixes both these problems.


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