Chuanqi Xu 2e6ae1d3f2 [libcxx] [Coroutine] Conform Coroutine Implementation
Since coroutine is merged in C++ standard and the support for coroutine
seems relatively stable. It's the time to move the implementation of
coroutine out of the experimental directory and the std::experimental
namespace. This patch creates header <coroutine> with conformed
implementation with C++ standard. To avoid breaking user's code too
fast, the <experimental/coroutine> header is remained. Note that
<experimental/coroutine> is deprecated and it would be removed in
LLVM15.

Reviewed By: Quuxplusone, ldionne

Differential Revision: https://reviews.llvm.org/D109433
2021-11-16 14:13:13 +08:00
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