Index: include/llvm/ADT/StringRef.h
===================================================================
--- include/llvm/ADT/StringRef.h
+++ include/llvm/ADT/StringRef.h
@@ -854,6 +854,8 @@
   public:
     template <size_t N>
     constexpr StringLiteral(const char (&Str)[N]) : StringRef(Str, N - 1) {}
+
+    const char *c_str() const { return data(); }
   };
 
   /// @name StringRef Comparison Operators