Now
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__HAVE_ATOMIC_AS_MEMBAR is spelled with two leading underscores.
This underscores the need to replace this error-prone cpp API by
unconditionally defined {pre,post}atomic_membar_*.
This change should only remove unnecessary membar_producers on x86.
This underscores the need to replace this error-prone cpp API by
unconditionally defined {pre,post}atomic_membar_*.
This change should only remove unnecessary membar_producers on x86.