Upgrade to 2022-era LLVM LIBCXX

third_party/libcxx/__bit/endian.h

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// 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___BIT_ENDIAN_H
+#define _LIBCPP___BIT_ENDIAN_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 20
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+enum class endian {
+  little = 0xDEAD,
+  big = 0xFACE,
+#  if defined(_LIBCPP_LITTLE_ENDIAN)
+  native = little
+#  elif defined(_LIBCPP_BIG_ENDIAN)
+  native = big
+#  else
+  native = 0xCAFE
+#  endif
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 20
+
+#endif // _LIBCPP___BIT_ENDIAN_H