[boost] Moving utility/declval.hpp to type_traits

Subject: [boost] Moving utility/declval.hpp to type_traits
From: Peter Dimov (lists_at_[hidden])
Date: 2014-06-04 20:28:46

I was going to move utility/declval.hpp to type_traits, but type_traits has 
many unmerged changes. Since the contents of declval.hpp are currently the 
same in master and develop, replaying its history on top of 
type_traits:master and type_traits:develop should not affect any later 
merges, but still, I always prefer to do this when master and develop are 
identical, so thought I'd ask first. John?