Merge pull request #1848 from danra/patch-42

Use auto instead of repeating explicit class names

include/swift/Basic/DiverseList.h

@@ -192,7 +192,7 @@ public:
       return *this;
     }
     iterator operator++(int _) {
-      iterator copy = *this;
+      auto copy = *this;
       operator++();
       return copy;
     }
@@ -235,7 +235,7 @@ public:
       return *this;
     }
     const_iterator operator++(int _) {
-      const_iterator copy = *this;
+      auto copy = *this;
       operator++();
       return copy;
     }