[libcxx-commits] [libcxxabi] [libc++abi] Revert gating of `__cxa_thread_atexit` on Linux||Fuchsia (PR #186054)

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whitequark wrote:

My position is that right now an architecture is *broken*. We should fix that first and then discuss a cleaner solution later.

https://github.com/llvm/llvm-project/pull/186054