[libc-commits] [libc] [libc] ensure tls dtors are called in main thread (PR #133641)

[Petr Hosek via libc-commits]

petrhosek wrote:

> I'm not 100% sure what the proper handling of this, but seeing weak symbols thrown around like this makes me uneasy.

The use of weak symbols here actually broke all of our baremetal uses, see https://github.com/llvm/llvm-project/issues/173409.

https://github.com/llvm/llvm-project/pull/133641