Mark de Wever 88622aabf1 [libc++][format] Implements formatter thread::id.
Since stacktrace header is WIP and it's not sure that will be done
before LLVM17 update the documentation. When the header is implemented
implementing the formatter is trivial, so that can be done quickly
afterwards.

Implements parts of:
 - P2693R1 Formatting thread::id and stacktrace

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D144331
2023-04-08 16:39:34 +02:00
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