Import C++ Standard Template Library

You can now use the hardest fastest and most dangerous language there is
with Cosmopolitan. So far about 75% of LLVM libcxx has been added. A few
breaking changes needed to be made to help this go smoothly.

- Rename nothrow to dontthrow
- Rename nodiscard to dontdiscard
- Add some libm functions, e.g. lgamma, nan, etc.
- Change intmax_t from int128 to int64 like everything else
- Introduce %jjd formatting directive for int128_t
- Introduce strtoi128(), strtou128(), etc.
- Rename bsrmax() to bsr128()

Some of the templates that should be working currently are std::vector,
std::string, std::map, std::set, std::deque, etc.

third_party/libcxx/new_handler_fallback.hh

@@ -0,0 +1,26 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "third_party/libcxx/__config"
+#include "third_party/libcxx/new"
+#include "third_party/libcxx/atomic_support.hh"
+
+namespace std {
+
+_LIBCPP_SAFE_STATIC static std::new_handler __new_handler;
+
+new_handler set_new_handler(new_handler handler) _NOEXCEPT {
+  return __libcpp_atomic_exchange(&__new_handler, handler);
+}
+
+new_handler get_new_handler() _NOEXCEPT {
+  return __libcpp_atomic_load(&__new_handler);
+}
+
+} // namespace std