Benjamin Kramer 351e9f3a73 [ADT] Replace sys::MemoryFence with standard atomics. ...

This is a bit faster in theory, in practice it's cold code that's only
active in !NDEBUG, so it probably doesn't make a difference. This is one
of the last users of our homegrown Atomic.h.

llvm-svn: 323999

2018-02-01 20:28:33 +00:00

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