Adding some includes to appease build bots. Amends r203354

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203356 91177308-0d34-0410-b5e6-96231b3b80d8

Author: AaronBallman

include/llvm/ADT/iterator_range.h

@@ -19,6 +19,8 @@
 #ifndef LLVM_ADT_ITERATOR_RANGE_H
 #define LLVM_ADT_ITERATOR_RANGE_H
 
+#include <algorithm>
+#include <iterator>
 #include <utility>
 
 namespace llvm {
@@ -52,9 +54,9 @@ class iterator_range {
 
 /// \brief Determine the distance between the end() and begin() iterators of
 /// a range. Analogous to std::distance().
-template <class Range>
-typename range_traits<Range>::difference_type distance(Range R) {
-  return std::distance(R.begin(), R.end());
+template <class Range>
+typename range_traits<Range>::difference_type distance(Range R) {
+  return std::distance(R.begin(), R.end());
 }
 
 /// \brief Copies members of a range into the output iterator provided.