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

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whitequark wrote:

cc @philnik777; could you explain a bit more about the rationale for that `#ifdef`? I removed it entirely because it seemed like a mistake to me, but in principle I don't see anything wrong with adding `|| defined(__wasi__)` to the condition list.

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