[libc++] Fix a few problems found by clang-tidy

Author: philnik777

libcxx/include/__flat_map/flat_map.h

@@ -113,7 +113,7 @@ class flat_map {
   class value_compare {
   private:
     key_compare __comp_;
-    value_compare(key_compare __c) : __comp_(__c) {}
+    _LIBCPP_HIDE_FROM_ABI value_compare(key_compare __c) : __comp_(__c) {}
     friend flat_map;
 
   public:
@@ -659,7 +659,7 @@ class flat_map {
 
   template <class _InputIterator>
     requires __has_input_iterator_category<_InputIterator>::value
-  void insert(sorted_unique_t, _InputIterator __first, _InputIterator __last) {
+  _LIBCPP_HIDE_FROM_ABI void insert(sorted_unique_t, _InputIterator __first, _InputIterator __last) {
     if constexpr (sized_sentinel_for<_InputIterator, _InputIterator>) {
       __reserve(__last - __first);
     }

libcxx/include/__locale_dir/locale_base_api.h

@@ -265,17 +265,17 @@ _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wformat-nonliteral") // GCC doesn't support [[g
 template <class... _Args>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_VARIADIC_ATTRIBUTE_FORMAT(__printf__, 4, 5) int __snprintf(
     char* __s, size_t __n, __locale_t __loc, const char* __format, _Args&&... __args) {
-  return __libcpp_snprintf_l(__s, __n, __loc, __format, std::forward<_Args>(__args)...);
+  return std::__libcpp_snprintf_l(__s, __n, __loc, __format, std::forward<_Args>(__args)...);
 }
 template <class... _Args>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_VARIADIC_ATTRIBUTE_FORMAT(__printf__, 3, 4) int __asprintf(
     char** __s, __locale_t __loc, const char* __format, _Args&&... __args) {
-  return __libcpp_asprintf_l(__s, __loc, __format, std::forward<_Args>(__args)...);
+  return std::__libcpp_asprintf_l(__s, __loc, __format, std::forward<_Args>(__args)...);
 }
 template <class... _Args>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_VARIADIC_ATTRIBUTE_FORMAT(__scanf__, 3, 4) int __sscanf(
     const char* __s, __locale_t __loc, const char* __format, _Args&&... __args) {
-  return __libcpp_sscanf_l(__s, __loc, __format, std::forward<_Args>(__args)...);
+  return std::__libcpp_sscanf_l(__s, __loc, __format, std::forward<_Args>(__args)...);
 }
 _LIBCPP_DIAGNOSTIC_POP
 #  undef _LIBCPP_VARIADIC_ATTRIBUTE_FORMAT

libcxx/include/__ranges/to.h

@@ -111,14 +111,14 @@ template <class _Container, input_range _Range, class... _Args>
 
       for (auto&& __ref : __range) {
         using _Ref = decltype(__ref);
-        if constexpr (requires { __result.emplace_back(declval<_Ref>()); }) {
+        if constexpr (requires { __result.emplace_back(std::declval<_Ref>()); }) {
           __result.emplace_back(std::forward<_Ref>(__ref));
-        } else if constexpr (requires { __result.push_back(declval<_Ref>()); }) {
+        } else if constexpr (requires { __result.push_back(std::declval<_Ref>()); }) {
           __result.push_back(std::forward<_Ref>(__ref));
-        } else if constexpr (requires { __result.emplace(__result.end(), declval<_Ref>()); }) {
+        } else if constexpr (requires { __result.emplace(__result.end(), std::declval<_Ref>()); }) {
           __result.emplace(__result.end(), std::forward<_Ref>(__ref));
         } else {
-          static_assert(requires { __result.insert(__result.end(), declval<_Ref>()); });
+          static_assert(requires { __result.insert(__result.end(), std::declval<_Ref>()); });
           __result.insert(__result.end(), std::forward<_Ref>(__ref));
         }
       }