Provide names for template and function parameters in forward declarations.  The purpose is to aid automated documentation tools.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@133008 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/string b/include/string
index f05fe36..249af09 100644
--- a/include/string
+++ b/include/string
@@ -972,23 +972,24 @@
 
 template<class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>
-operator+(const basic_string<_CharT, _Traits, _Allocator>&, const basic_string<_CharT, _Traits, _Allocator>&);
+operator+(const basic_string<_CharT, _Traits, _Allocator>& __x,
+          const basic_string<_CharT, _Traits, _Allocator>& __y);
 
 template<class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>
-operator+(const _CharT*, const basic_string<_CharT,_Traits,_Allocator>&);
+operator+(const _CharT* __x, const basic_string<_CharT,_Traits,_Allocator>& __y);
 
 template<class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>
-operator+(_CharT, const basic_string<_CharT,_Traits,_Allocator>&);
+operator+(_CharT __x, const basic_string<_CharT,_Traits,_Allocator>& __y);
 
 template<class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>
-operator+(const basic_string<_CharT, _Traits, _Allocator>&, const _CharT*);
+operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, const _CharT* __y);
 
 template<class _CharT, class _Traits, class _Allocator>
 basic_string<_CharT, _Traits, _Allocator>
-operator+(const basic_string<_CharT, _Traits, _Allocator>&, _CharT);
+operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, _CharT __y);
 
 template <bool>
 class __basic_string_common