[libc++] Make variables in templates inline (#115785)

The variables are all `constexpr`, which implies `inline`. Since they
aren't `constexpr` in C++03 they're also not `inline` there. Because of

[libc++] Make variables in templates inline (#115785)

The variables are all `constexpr`, which implies `inline`. Since they
aren't `constexpr` in C++03 they're also not `inline` there. Because of
that we define them out-of-line currently. Instead we can use the C++17
extension of `inline` variables, which results in the same weak
definitions of the variables but without having all the boilerplate.

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[libc++] Fix backslash as root dir breaks lexically_relative, lexically_proximate and hash_value on Windows (#99780)

Various functions like hash_value, lexically_proximate and lexically_relative
wo

[libc++] Fix backslash as root dir breaks lexically_relative, lexically_proximate and hash_value on Windows (#99780)

Various functions like hash_value, lexically_proximate and lexically_relative
would incorrectly handle backslashes in the root directory on Windows, causing
behavior that is inconsistent with the equality comparison for a path.

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[libc++] Get the GCC build mostly clean of warnings (#96604)

The GCC build has gotten to the point where it's often hard to find the
actual error in the build log. We should look into enabling thes

[libc++] Get the GCC build mostly clean of warnings (#96604)

The GCC build has gotten to the point where it's often hard to find the
actual error in the build log. We should look into enabling these
warnings again in the future, but it looks like a lot of them are
bogous.

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[libc++] Format the code base (#74334)

This patch runs clang-format on all of libcxx/include and libcxx/src, in
accordance with the RFC discussed at [1]. Follow-up patches will format
the benchmar

[libc++] Format the code base (#74334)

This patch runs clang-format on all of libcxx/include and libcxx/src, in
accordance with the RFC discussed at [1]. Follow-up patches will format
the benchmarks, the test suite and remaining parts of the code. I'm
splitting this one into its own patch so the diff is a bit easier to
review.

This patch was generated with:

find libcxx/include libcxx/src -type f \
| grep -v 'module.modulemap.in' \
| grep -v 'CMakeLists.txt' \
| grep -v 'README.txt' \
| grep -v 'libcxx.imp' \
| grep -v '__config_site.in' \
| xargs clang-format -i

A Git merge driver is available in libcxx/utils/clang-format-merge-driver.sh
to help resolve merge and rebase issues across these formatting changes.

[1]: https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all

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[libc++] Split sources for <filesystem>

The operations.cpp file contained the implementation of a ton of
functionality unrelated to just the filesystem operations, and
filesystem_common.h contained

[libc++] Split sources for <filesystem>

The operations.cpp file contained the implementation of a ton of
functionality unrelated to just the filesystem operations, and
filesystem_common.h contained a lot of unrelated functionality as well.

Splitting this up into more files will make it possible in the future
to support parts of <filesystem> (e.g. path) on systems where there is
no notion of a filesystem.

Differential Revision: https://reviews.llvm.org/D152377

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