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__cxa_guard_acquire,__cxa_guard_release, and__cxa_guard_abortare emitted with-fthreadsafe-statics. Most commonly when building thelibcxx_19_localebranch.We currently define
-fno-threadsafe-statics(see also #749) so Clang won't normally emit these. But they are harmless to add into the toolchain, and prevent users in the future from receiving linker errors.