[libc-commits] [libc] [libc][threads] Add architecture-specific Thread Control Block definitions (PR #220607)

[Alexey Samsonov via libc-commits]

https://github.com/vonosmas approved this pull request.

This part seems straightforward (and aligned with my somewhat recent investigation of arch-specific TLS ABI). The follow-up patch - not so much, hope we can get more eyes to look into that soon.

https://github.com/llvm/llvm-project/pull/220607