Hui 477f6bc407 [libc++] Make stop_token experimental
There are discussions about different ways of implementing `stop_token` to make it more performant
mark `stop_token` as experimental to allow us to change the design before it is shipped

Co-authored-by: Louis Dionne <ldionne.2@gmail.com>

Differential Revision: https://reviews.llvm.org/D154700
2023-07-11 08:52:31 -04:00
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