Implement LWG685 (which is from C++11!). Fixes PR#28421. Note: this (subtly) changes the return type of operator-(Iter1, Iter2) where Iter1 is a reverse iterator or a move_iterator, and Iter2 is some other move/reverse iterator type. In practice, I believe that almost every time the second param will be const_XXX and this will mean that the return type will be the same as it was before. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@274880 91177308-0d34-0410-b5e6-96231b3b80d8
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