Fix methods return type ampersand location (NFC)

Author: danra

include/swift/Basic/Algorithm.h

@@ -21,13 +21,13 @@
 namespace swift {
   /// Returns the minimum of `a` and `b`, or `a` if they are equivalent.
   template <typename T>
-  constexpr const T& min(const T &a, const T &b) {
+  constexpr const T &min(const T &a, const T &b) {
     return !(b < a) ? a : b;
   }
 
   /// Returns the maximum of `a` and `b`, or `a` if they are equivalent.
   template <typename T>
-  constexpr const T& max(const T &a, const T &b) {
+  constexpr const T &max(const T &a, const T &b) {
     return (a < b) ? b : a;
   }
 } // end namespace swift