A. Jiang 94e7c0b051 [libc++] Remove get_temporary_buffer and return_temporary_buffer (#100914) ...

Works towards P0619R4 / #99985.

The use of `std::get_temporary_buffer` and `std::return_temporary_buffer`
are replaced with `unique_ptr`-based RAII buffer holder.

Escape hatches:
- `_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER` restores
`std::get_temporary_buffer` and `std::return_temporary_buffer`.

Drive-by changes:
- In `<syncstream>`, states that `get_temporary_buffer` is now removed,
because `<syncstream>` is added in C++20.

2024-09-16 11:53:05 -04:00

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