b30f9d74d6
This has been added in 0071a79532 to
support TLS destructors. Return value of __cxa_thread_atexit is supposed
to be the same as std::atexit - zero on success, non-zero on failure.
Update the code to do just that (also be consistent with llvm-libc's
existing atexit / at_quick_exit implementations).
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