[libc++] Apply clang formatting to all string unit tests

This applies clang-format to the std::string unit tests in preparation
for landing https://reviews.llvm.org/D140550.

Differential Revision:

[libc++] Apply clang formatting to all string unit tests

This applies clang-format to the std::string unit tests in preparation
for landing https://reviews.llvm.org/D140550.

Differential Revision: https://reviews.llvm.org/D140612

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[libc++][Modules] Make top level modules for all C++ headers with OS/clang versions

The headers that include_next compiler and OS headers need to be in different top level modules in order to avoid

[libc++][Modules] Make top level modules for all C++ headers with OS/clang versions

The headers that include_next compiler and OS headers need to be in different top level modules in order to avoid module cycles. e.g. libc++'s stdlib.h will #include_next stdlib.h from the compiler and then the C library. Either of those are likely to include stddef.h, which will come back up to the libc++ module map and create a module cycle. Putting stdlib.h and stddef.h (and the rest of the C standard library headers) in top level modules resolves this by letting the order go cxx_stdlib_h -> os_stdlib_h -> cxx_stddef_h -> os_stddef_h.

All of those headers' dependencies then need to be moved into top level modules themselves to avoid module cycles between the new top level level cstd modules. This starts to get complicated, as the libc++ C headers, by standard, have to include many of the C++ headers, which include the private detail headers, which are intertwined. e.g. some `__algorithm` headers include `__memory` headers and vice versa.

Make top level modules for all of the libc++ headers to easily guarantee that the modules aren't cyclic.

Add enough module exports to fix `check-cxx` and `run-buildbot generic-modules`.

`__stop_token/intrusive_shared_ptr.h` uses `__atomic/atomic.h` but has no include path to it. Add that include.
`math.h` absorbs `bits/atomic_wide_counter.h` on some platforms that don't have modules, work around that by including `math.h` in `__threading_support`.
<mutex> doesn't actually require threads, there are a few pieces like once_flag that work without threads. Remove the requirement from its module.
AIX is no longer able to support modular builds.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D144322

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[libc++][NFC] Add __element_count and use it in the constexpr C functions

This makes it less ambiguous what the parameter is meant to get.

Reviewed By: #libc, ldionne

Spies: ldionne, libcxx-commit

[libc++][NFC] Add __element_count and use it in the constexpr C functions

This makes it less ambiguous what the parameter is meant to get.

Reviewed By: #libc, ldionne

Spies: ldionne, libcxx-commits

Differential Revision: https://reviews.llvm.org/D152040

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[libc++] Forward to std::{,w}memchr in std::find

Reviewed By: #libc, ldionne

Spies: Mordante, libcxx-commits, ldionne, mikhail.ramalho

Differential Revision: https://reviews.llvm.org/D144394

[libc++] Use the __is_trivially_equality_comparable builtin

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D148553

[libc++] Move constexpr <cstring> functions into their own headers and remove unused <cstring> includes

Reviewed By: ldionne, Mordante, #libc, #libc_abi

Spies: libcxx-commits

Differential Revision

[libc++] Move constexpr <cstring> functions into their own headers and remove unused <cstring> includes

Reviewed By: ldionne, Mordante, #libc, #libc_abi

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D143329

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[libc++] Refactor char_traits

This allows us to reuse workarounds for compilers that don't provide the builtins or constexpr support.

Reviewed By: ldionne, Mordante, #libc

Spies: libcxx-commits

D

[libc++] Refactor char_traits

This allows us to reuse workarounds for compilers that don't provide the builtins or constexpr support.

Reviewed By: ldionne, Mordante, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D139555

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