[libc++] implement `std::flat_multimap` (#113835)

fixes https://github.com/llvm/llvm-project/issues/105190

---------

Co-authored-by: Hui Xie <huixie@Mac.broadband>
Co-authored-by: Hui Xie <hu

[libc++] implement `std::flat_multimap` (#113835)

fixes https://github.com/llvm/llvm-project/issues/105190

---------

Co-authored-by: Hui Xie <huixie@Mac.broadband>
Co-authored-by: Hui Xie <huixie@Huis-MacBook-Pro.local>

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[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002)

This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-

[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002)

This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the
RFC, we initially proposed selecting the right headers from the Clang
driver, however consensus seemed to steer towards handling this in the
library itself. This patch implements that direction.

At a high level, the changes basically amount to making each public
header look like this:

```
// inside <vector>
#ifdef _LIBCPP_CXX03_LANG
# include <__cxx03/vector>
#else
// normal <vector> content
#endif
```

In most cases, public headers are simple umbrella headers so there isn't
much code in the #else branch. In other cases, the #else branch contains
the actual implementation of the header.

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[libc++] Properly guard flat_map includes based on C++ version (#119227)

That's what we (try to) do consistently for all other umbrella headers.

As a drive-by, remove the <__assert> header which

[libc++] Properly guard flat_map includes based on C++ version (#119227)

That's what we (try to) do consistently for all other umbrella headers.

As a drive-by, remove the <__assert> header which is not mandated
anymore.

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[libc++] Add #if 0 block to all the top-level headers (#119234)

Including The frozen C++03 headers results in a lot of formatting
changes in the main headers, so this splits these changes into a
sep

[libc++] Add #if 0 block to all the top-level headers (#119234)

Including The frozen C++03 headers results in a lot of formatting
changes in the main headers, so this splits these changes into a
separate commit instead.

This is part of
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.

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[libc++] Implement P0429R9 `std::flat_map` (#98643)

Around half of the tests are based on the tests Arthur O'Dwyer's
original implementation of std::flat_map, with modifications and
removals.

p

[libc++] Implement P0429R9 `std::flat_map` (#98643)

Around half of the tests are based on the tests Arthur O'Dwyer's
original implementation of std::flat_map, with modifications and
removals.

partially implement #105190

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