Louis Dionne 053d9e5832 [libc++] Move __thread_id out of <__threading_support>
This makes <__threading_support> closer to handling only the bridge
between the system's implementation of threading and the rest of libc++.

Differential Revision: https://reviews.llvm.org/D154464
2023-07-11 08:58:27 -04:00
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