Remove iterator_range::end.

Because the current proposal does not include that member function,
and we are trying to keep in line with that.

llvm-svn: 248451

include/llvm/ADT/iterator_range.h

@@ -45,7 +45,6 @@ public:
 
   IteratorT begin() const { return begin_iterator; }
   IteratorT end() const { return end_iterator; }
-  bool empty() const { return begin_iterator == end_iterator; }
 };
 
 /// \brief Convenience function for iterating over sub-ranges.