Upgrade to 2022-era LLVM LIBCXX

third_party/libcxx/__algorithm/ranges_fill.h

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+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_FILL_H
+#define _LIBCPP___ALGORITHM_RANGES_FILL_H
+
+#include <__algorithm/ranges_fill_n.h>
+#include <__config>
+#include <__iterator/concepts.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/dangling.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 20
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+namespace __fill {
+struct __fn {
+  template <class _Type, output_iterator<const _Type&> _Iter, sentinel_for<_Iter> _Sent>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  _Iter operator()(_Iter __first, _Sent __last, const _Type& __value) const {
+    if constexpr(random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>) {
+      return ranges::fill_n(__first, __last - __first, __value);
+    } else {
+      for (; __first != __last; ++__first)
+        *__first = __value;
+      return __first;
+    }
+  }
+
+  template <class _Type, output_range<const _Type&> _Range>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  borrowed_iterator_t<_Range> operator()(_Range&& __range, const _Type& __value) const {
+    return (*this)(ranges::begin(__range), ranges::end(__range), __value);
+  }
+};
+} // namespace __fill
+
+inline namespace __cpo {
+  inline constexpr auto fill = __fill::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 20
+
+#endif // _LIBCPP___ALGORITHM_RANGES_FILL_H