diff --git a/llvm/include/llvm/Support/FormatProviders.h b/llvm/include/llvm/Support/FormatProviders.h
--- a/llvm/include/llvm/Support/FormatProviders.h
+++ b/llvm/include/llvm/Support/FormatProviders.h
@@ -355,7 +355,6 @@
 
 template <typename IterT> class format_provider<llvm::iterator_range<IterT>> {
   using value = typename std::iterator_traits<IterT>::value_type;
-  using reference = typename std::iterator_traits<IterT>::reference;
 
   static StringRef consumeOneOption(StringRef &Style, char Indicator,
                                     StringRef Default) {
@@ -403,15 +402,13 @@
     auto Begin = V.begin();
     auto End = V.end();
     if (Begin != End) {
-      auto Adapter =
-          detail::build_format_adapter(std::forward<reference>(*Begin));
+      auto Adapter = detail::build_format_adapter(*Begin);
       Adapter.format(Stream, ArgStyle);
       ++Begin;
     }
     while (Begin != End) {
       Stream << Sep;
-      auto Adapter =
-          detail::build_format_adapter(std::forward<reference>(*Begin));
+      auto Adapter = detail::build_format_adapter(*Begin);
       Adapter.format(Stream, ArgStyle);
       ++Begin;
     }
diff --git a/llvm/include/llvm/Support/FormatVariadicDetails.h b/llvm/include/llvm/Support/FormatVariadicDetails.h
--- a/llvm/include/llvm/Support/FormatVariadicDetails.h
+++ b/llvm/include/llvm/Support/FormatVariadicDetails.h
@@ -75,8 +75,6 @@
 // Test if raw_ostream& << T -> raw_ostream& is findable via ADL.
 template <class T> class has_StreamOperator {
 public:
-  using ConstRefT = const std::decay_t<T> &;
-
   template <typename U>
   static char test(
       std::enable_if_t<std::is_same<decltype(std::declval<llvm::raw_ostream &>()
@@ -86,7 +84,7 @@
 
   template <typename U> static double test(...);
 
-  static bool const value = (sizeof(test<ConstRefT>(nullptr)) == 1);
+  static bool const value = (sizeof(test<T>(nullptr)) == 1);
 };
 
 // Simple template that decides whether a type T should use the member-function