[libc++] Move once_flag outside of <mutex> #8
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Stack from ghstack (oldest at bottom):
This allows including once_flag directly from <__locale> instead of
depending on all of , which requires threading. In turn, this
makes it easier to support locales on platforms without threading.
Drive-by change: clang-format once_flag.h and use _LIBCPP_HIDE_FROM_ABI
Differential Revision: https://reviews.llvm.org/D155487